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Hodge theory

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574:. He further conjectured that each cohomology class should have a distinguished representative with the property that both it and its dual vanish under the exterior derivative operator; these are now called harmonic forms. Hodge devoted most of the 1930s to this problem. His earliest published attempt at a proof appeared in 1933, but he considered it "crude in the extreme". 2797: 5574:
This example suggests several different roles played by Hodge theory in complex algebraic geometry. First, Hodge theory gives restrictions on which topological spaces can have the structure of a smooth complex projective variety. Second, Hodge theory gives information about the moduli space of smooth
818: 578:, one of the most brilliant mathematicians of the era, found himself unable to determine whether Hodge's proof was correct or not. In 1936, Hodge published a new proof. While Hodge considered the new proof much superior, a serious flaw was discovered by Bohnenblust. Independently, Hermann Weyl and 586:
In retrospect it is clear that the technical difficulties in the existence theorem did not really require any significant new ideas, but merely a careful extension of classical methods. The real novelty, which was Hodge’s major contribution, was in the conception of harmonic integrals and their
2359: 2659: 1510: 270:, and that therefore each of the terms on the left-hand side are vector space duals of one another. In contemporary language, de Rham's theorem is more often phrased as the statement that singular cohomology with real coefficients is isomorphic to de Rham cohomology: 565:
Hodge felt that these techniques should be applicable to higher dimensional varieties as well. His colleague Peter Fraser recommended de Rham's thesis to him. In reading de Rham's thesis, Hodge realized that the real and imaginary parts of a holomorphic 1-form on a
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is a positive volume form, from which Lefschetz was able to rederive Riemann's inequalities. In 1929, W. V. D. Hodge learned of Lefschetz's paper. He immediately observed that similar principles applied to algebraic surfaces. More precisely, if
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A crucial point is that the Hodge decomposition is a decomposition of cohomology with complex coefficients that usually does not come from a decomposition of cohomology with integral (or rational) coefficients. As a result, the intersection
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This decomposition is in fact independent of the choice of Kähler metric (but there is no analogous decomposition for a general compact complex manifold). On the other hand, the Hodge decomposition genuinely depends on the structure of
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showed that the intersection homology of any complex projective variety (not necessarily smooth) has a pure Hodge structure, just as in the smooth case. In fact, the whole Kähler package extends to intersection homology.
1580: 154:, in which he suggested — but did not prove — that differential forms and topology should be linked. Upon reading it, Georges de Rham, then a student, was inspired. In his 1931 thesis, he proved a result now called 3460: 2244: 2792:{\displaystyle {\begin{aligned}{\mathcal {E}}^{\bullet }&=\bigoplus \nolimits _{i}\Gamma (E_{i})\\L&=\bigoplus \nolimits _{i}L_{i}:{\mathcal {E}}^{\bullet }\to {\mathcal {E}}^{\bullet }\end{aligned}}} 1671: 2946: 507: 456: 1758: 2536: 5019: 2213: 1282: 1143: 3742: 1406: 5606:, extends Hodge theory to all complex algebraic varieties, not necessarily smooth or compact. Namely, the cohomology of any complex algebraic variety has a more general type of decomposition, a 3073: 2664: 4376:
The "Kähler package" is a powerful set of restrictions on the cohomology of smooth complex projective varieties (or compact Kähler manifolds), building on Hodge theory. The results include the
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of a smooth complex projective variety (or compact Kähler manifold) are even, by Hodge symmetry. This is not true for compact complex manifolds in general, as shown by the example of the
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of an elliptic operator on a closed manifold is always a finite-dimensional vector space. Another consequence of the Hodge theorem is that a Riemannian metric on a closed manifold
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relevance to algebraic geometry. This triumph of concept over technique is reminiscent of a similar episode in the work of Hodge’s great predecessor Bernhard Riemann.
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is dual to a cohomology class which we will call , and the cap product can be computed by taking the cup product of and α and capping with the fundamental class of
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A fundamental aspect of complex geometry is that there are continuous families of non-isomorphic complex manifolds (which are all diffeomorphic as real manifolds).
176: 5461: 5129: 885: 276: 5723: 5703: 5675: 5655: 5435: 5407: 5239: 5196: 5172: 5152: 5096: 5072: 4828: 4804: 4533: 4510: 4490: 4470: 3506: 813:{\displaystyle 0\to \Omega ^{0}(M)\xrightarrow {d_{0}} \Omega ^{1}(M)\xrightarrow {d_{1}} \cdots \xrightarrow {d_{n-1}} \Omega ^{n}(M)\xrightarrow {d_{n}} 0,} 2555: 108:, is encompassed by the latter case. Hodge theory has become an important tool in algebraic geometry, particularly through its connection to the study of 1000: 2830: 1978: 3117: 4388:. Many of these results follow from fundamental technical tools which may be proven for compact Kähler manifolds using Hodge theory, including the 570:
were in some sense dual to each other. He suspected that there should be a similar duality in higher dimensions; this duality is now known as the
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Because is a cohomology class, it has a Hodge decomposition. By the computation we did above, if we cup this class with any class of type
2354:{\displaystyle \Omega ^{k}(M)\cong \operatorname {im} d_{k-1}\oplus \operatorname {im} \delta _{k+1}\oplus {\mathcal {H}}_{\Delta }^{k}(M).} 582:
modified Hodge's proof to repair the error. This established Hodge's sought-for isomorphism between harmonic forms and cohomology classes.
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Huybrechts (2005), sections 3.3 and 5.2; Griffiths & Harris (1994), sections 0.7 and 1.2; Voisin (2007), v. 1, ch. 6, and v. 2, ch. 1.
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from Chow groups to ordinary cohomology, but Hodge theory also gives information about the kernel of the cycle map, for example using the
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holds, meaning that the variety is determined up to isomorphism by its Hodge structure. Finally, Hodge theory gives information about the
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De Rham's original statement is then a consequence of the fact that over the reals, singular cohomology is the dual of singular homology.
3368: 1965: 1595: 5102: 6105: 6034: 5967: 2904: 6130: 6097: 6026: 466: 415: 4385: 1690: 2464: 1505:{\displaystyle (\omega ,\tau )\mapsto \langle \omega ,\tau \rangle :=\int _{M}\langle \omega (p),\tau (p)\rangle _{p}\sigma .} 4967: 2171: 39: 1230: 1091: 4042:). These are important invariants of a smooth complex projective variety; they do not change when the complex structure of 3667: 562:
itself must represent a non-zero cohomology class, so its periods cannot all be zero. This resolved a question of Severi.
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is varied continuously, and yet they are in general not topological invariants. Among the properties of Hodge numbers are
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are the sum of the Hodge numbers in a given row. A basic application of Hodge theory is then that the odd Betti numbers
3303:{\displaystyle f\,dz_{1}\wedge \cdots \wedge dz_{p}\wedge d{\overline {w_{1}}}\wedge \cdots \wedge d{\overline {w_{q}}}} 66: 5785: 3894: 4097: 1355: 6059: 5993: 5955: 2084:
has a unique harmonic representative. Concretely, the harmonic representative is the unique closed form of minimum
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For example, the Hodge theorem implies that the cohomology groups with real coefficients of a closed manifold are
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There is also a Hodge decomposition in this situation, generalizing the statement above for the de Rham complex.
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The Hodge numbers of a smooth complex projective variety (or compact Kähler manifold) can be listed in the
5218:. The difficulty of the Hodge conjecture reflects the lack of understanding of such integrals in general. 4431: 4381: 3121: 2542: 6193: 5759: 5615: 5607: 5588: 5215: 4954:{\displaystyle (H^{2p}(X,\mathbb {Z} )/{\text{torsion}})\cap H^{p,p}(X)\subseteq H^{2p}(X,\mathbb {C} )} 3500:
in cohomology, so the cup product with complex coefficients is compatible with the Hodge decomposition:
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as a generalization of the de Rham complex. The Hodge theorem extends to this setting, as follows. Let
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is big. In short, the Hodge conjecture predicts that the possible "shapes" of complex subvarieties of
532: 6122: 4389: 3844: 3331: 3199:, meaning forms that can locally be written as a finite sum of terms, with each term taking the form 2132: 1930: 155: 3969: 1937:
say that the electromagnetic field in a vacuum, i.e. absent any charges, is represented by a 2-form
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of their cohomology classes is zero, and when made explicit, this gave Lefschetz a new proof of the
4201: 3827: 3748: 2953: 1919:{\displaystyle {\mathcal {H}}_{\Delta }^{k}(M)=\{\alpha \in \Omega ^{k}(M)\mid \Delta \alpha =0\}.} 872: 831: 571: 124: 97: 6174: 5552: 4767: 2103:. (Admittedly, there are other ways to prove this.) Indeed, the operators Δ are elliptic, and the 1156: 5838: 5414: 5203: 3120:, complex projective manifolds are automatically algebraic: they are defined by the vanishing of 2100: 1934: 1814:
This is a second-order linear differential operator, generalizing the Laplacian for functions on
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set of components, each of complex dimension 19. The subspace of K3 surfaces with Picard number
5317: 5131:(even integrally, that is, without the need for a positive integral multiple in the statement). 4725: 4632: 3145: 2088:
norm that represents a given cohomology class. The Hodge theorem was proved using the theory of
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inner product is then defined as the integral of the pointwise inner product of a given pair of
159: 101: 146:, and the interaction between differential forms and topology was poorly understood. In 1928, 6152: 6101: 6071: 6030: 6018: 5997: 5963: 5951: 5628: 5207: 5175: 4435: 4068: 3780: 3486: 2089: 2063: 640: 405: 367: 256:{\displaystyle H_{k}(M;\mathbf {R} )\times H_{\text{dR}}^{k}(M;\mathbf {R} )\to \mathbf {R} .} 163: 70: 58: 5098:(the combination of integral cohomology with the Hodge decomposition of complex cohomology). 5024: 3809: 1331: 512: 6142: 6134: 6063: 5939: 5830: 5734: 4582:. Moreover, the resulting class has a special property: its image in the complex cohomology 4447: 3106: 2384: 2120: 2104: 2093: 1677: 1224: 1197: 971:{\displaystyle H^{k}(M,\mathbf {R} )\cong {\frac {\ker d_{k}}{\operatorname {im} d_{k-1}}}.} 579: 371: 43: 6166: 6115: 6085: 6044: 6011: 5977: 3013:
The cohomology of the complex is canonically isomorphic to the space of harmonic sections,
353:{\displaystyle H_{\text{sing}}^{k}(M;\mathbf {R} )\cong H_{\text{dR}}^{k}(M;\mathbf {R} ).} 6162: 6111: 6081: 6040: 6007: 5973: 5754: 5576: 5440: 5211: 4197: 3160: 3088: 2151: 1961: 1950: 839: 621: 567: 267: 109: 89: 47: 5108: 1515:
Naturally the above inner product induces a norm, when that norm is finite on some fixed
3635:{\displaystyle \smile \colon H^{p,q}(X)\times H^{p',q'}(X)\rightarrow H^{p+p',q+q'}(X).} 5985: 5855: 5708: 5688: 5678: 5660: 5640: 5620: 5603: 5583:
of algebraic cycles on a given variety. The Hodge conjecture is about the image of the
5420: 5392: 5224: 5181: 5157: 5137: 5081: 5057: 4813: 4789: 4518: 4495: 4475: 4455: 2643:{\displaystyle 0\to \Gamma (E_{0})\to \Gamma (E_{1})\to \cdots \to \Gamma (E_{N})\to 0} 2447: 2376: 2124: 1146: 591: 147: 116: 5575:
complex projective varieties with a given topological type. The best case is when the
5385:. Their intersection can have rank anywhere between 1 and 20; this rank is called the 6187: 6051: 5739: 5386: 4350: 4090: 3347: 3098: 2112: 1085: 393: 120: 1074:{\displaystyle \Omega ^{k}(M)=\Gamma \left(\bigwedge \nolimits ^{k}T^{*}(M)\right).} 5682: 5410: 4346: 4327: 636: 575: 130:
have given alternative proofs of, or analogous results to, classical Hodge theory.
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is an isomorphism of vector spaces. In other words, each real cohomology class on
5725:, as would arise from a family of varieties which need not be smooth or compact. 2891:{\displaystyle {\mathcal {H}}=\{e\in {\mathcal {E}}^{\bullet }\mid \Delta e=0\}.} 2049:{\displaystyle \varphi :{\mathcal {H}}_{\Delta }^{k}(M)\to H^{k}(M,\mathbf {R} )} 5764: 5613:
A different generalization of Hodge theory to singular varieties is provided by
4513: 4393: 3799: 3497: 633: 401: 31: 3075:, in the sense that each cohomology class has a unique harmonic representative. 6147: 6138: 5584: 5580: 4247: 3355: 2546: 2380: 2235: 143: 6067: 17: 2824:. As in the de Rham case, this yields the vector space of harmonic sections 2092:
partial differential equations, with Hodge's initial arguments completed by
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Taking wedge products of these harmonic representatives corresponds to the
1575:{\displaystyle \langle \omega ,\omega \rangle =\|\omega \|^{2}<\infty ,} 2161:. This says that there is a unique decomposition of any differential form 5685:
is a generalization. Roughly speaking, a mixed Hodge module on a variety
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describes how the Hodge structure of a smooth complex projective variety
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was still nascent in the 1920s. It had not yet developed the notion of
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Lefschetz, Solomon (1927). "Correspondences Between Algebraic Curves".
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components of a harmonic form are again harmonic. Therefore, for any
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with complex coefficients as a direct sum of complex vector spaces:
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which has a strong compatibility with the complex structure, making
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on a closed Riemannian manifold as a sum of three parts in the form
791: 749: 729: 693: 3455:{\displaystyle H^{r}(X,\mathbf {C} )=\bigoplus _{p+q=r}H^{p,q}(X).} 1585:
then the integrand is a real valued, square integrable function on
5767:, a key consequence of Hodge theory for compact Kähler manifolds. 5571:, but for "special" K3 surfaces the intersection can be bigger.) 1666:{\displaystyle \|\omega (p)\|_{p}:M\to \mathbf {R} \in L^{2}(M).} 3784: 3170:(with complex coefficients) can be written uniquely as a sum of 2549:
sections of these vector bundles, and that the induced sequence
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While Hodge theory is intrinsically dependent upon the real and
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As originally stated, de Rham's theorem asserts that this is a
6129:, Graduate Texts in Mathematics, vol. 65 (3rd ed.), 5463:. (Thus, for most projective K3 surfaces, the intersection of 594:, William Vallance Douglas Hodge, 17 June 1903 – 7 July 1975, 5198:. In this sense, Hodge theory is related to a basic issue in 4472:
be a smooth complex projective variety. A complex subvariety
2941:{\displaystyle H:{\mathcal {E}}^{\bullet }\to {\mathcal {H}}} 463:
is a non-zero holomorphic form on an algebraic surface, then
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as a complex manifold (not on the choice of Kähler metric):
3044: 2933: 2917: 2856: 2836: 2774: 2757: 2670: 2323: 1991: 1839: 502:{\displaystyle {\sqrt {-1}}\,\omega \wedge {\bar {\omega }}} 451:{\displaystyle {\sqrt {-1}}\,\omega \wedge {\bar {\omega }}} 5154:
describes the integrals of algebraic differential forms on
1753:{\displaystyle \delta :\Omega ^{k+1}(M)\to \Omega ^{k}(M).} 879:
with real coefficients is computed by the de Rham complex:
5862:, Biogr. Mem. Fellows R. Soc., 1976, vol. 22, pp. 169–192. 5860:
William Vallance Douglas Hodge, 17 June 1903 – 7 July 1975
5202:: there is in general no "formula" for the integral of an 4786:-linear combination of classes of complex subvarieties of 5677:
varies. In geometric terms, this amounts to studying the
6175:
Python code for computing Hodge numbers of hypersurfaces
2531:{\displaystyle L_{i}:\Gamma (E_{i})\to \Gamma (E_{i+1})} 84:
The theory was developed by Hodge in the 1930s to study
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associated to a family of varieties. Saito's theory of
5014:{\displaystyle H^{2p}(X,\mathbb {Z} )/{\text{torsion}}} 4722:
whose image in complex cohomology lies in the subspace
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metric on differential forms, this gives an orthogonal
2208:{\displaystyle \omega =d\alpha +\delta \beta +\gamma ,} 1589:, evaluated at a given point via its point-wise norms, 6094:
Foundations of Differentiable Manifolds and Lie Groups
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On the other hand, the integral can be written as the
3653:) of the Hodge decomposition can be identified with a 1277:{\displaystyle \bigwedge \nolimits ^{k}(T_{p}^{*}(M))} 1138:{\displaystyle \bigwedge \nolimits ^{k}(T_{p}^{*}(M))} 6056:
Hodge Theory and Complex Algebraic Geometry (2 vols.)
5711: 5691: 5663: 5643: 5555: 5513: 5469: 5443: 5423: 5395: 5362: 5320: 5291: 5247: 5227: 5184: 5160: 5140: 5111: 5084: 5060: 5027: 4970: 4843: 4816: 4792: 4770: 4728: 4681: 4635: 4629:
lies in the middle piece of the Hodge decomposition,
4588: 4541: 4521: 4498: 4478: 4458: 4399: 3972: 3897: 3847: 3812: 3737:{\displaystyle H^{p,q}(X)\cong H^{q}(X,\Omega ^{p}),} 3670: 3509: 3371: 3208: 3019: 2907: 2833: 2662: 2558: 2467: 2450:, equipped with metrics, on a closed smooth manifold 2393: 2247: 2174: 2066: 1981: 1835: 1776: 1693: 1598: 1528: 1409: 1358: 1334: 1290: 1233: 1200: 1159: 1094: 1003: 888: 663: 535: 515: 469: 418: 279: 179: 5221:
Example: For a smooth complex projective K3 surface
596:
Biographical Memoirs of Fellows of the Royal Society
388:
are holomorphic differentials on an algebraic curve
152:
Sur les nombres de Betti des espaces de groupes clos
104:. Hodge's primary motivation, the study of complex 5074:(as described by cohomology) are determined by the 4764:should have a positive integral multiple that is a 3068:{\displaystyle H(E_{j})\cong {\mathcal {H}}(E_{j})} 2653:is an elliptic complex. Introduce the direct sums: 2364:The Hodge decomposition is a generalization of the 5717: 5697: 5669: 5649: 5563: 5541: 5499: 5455: 5429: 5401: 5377: 5348: 5306: 5277: 5233: 5190: 5166: 5146: 5123: 5090: 5066: 5046: 5013: 4953: 4822: 4798: 4778: 4756: 4714: 4663: 4621: 4574: 4527: 4504: 4484: 4464: 4417: 4034:) means the dimension of the complex vector space 4012: 3958: 3883: 3818: 3736: 3634: 3454: 3302: 3067: 2940: 2890: 2791: 2642: 2530: 2438: 2353: 2207: 2072: 2048: 1918: 1803: 1752: 1665: 1574: 1504: 1392: 1340: 1312: 1276: 1216: 1186: 1137: 1073: 970: 812: 550: 521: 501: 450: 400:has only one complex dimension; consequently, the 352: 255: 5990:The Theory and Applications of Harmonic Integrals 3959:{\displaystyle H^{2n}(X,\mathbb {C} )=H^{n,n}(X)} 3354:, the Hodge theorem gives a decomposition of the 2123:. It follows, for example, that the image of the 2150:is finite (because the group of isometries of a 370:used topological methods to reprove theorems of 166:chains induces, for any compact smooth manifold 1393:{\displaystyle \omega ,\tau \in \Omega ^{k}(M)} 77:operator of the metric. Such forms are called 5962:. Wiley Classics Library. Wiley Interscience. 5784:Chatterji, Srishti; Ojanguren, Manuel (2010), 4434:also give strong restrictions on the possible 96:. It has major applications in two settings: 3083:Hodge theory for complex projective varieties 412:is a non-zero holomorphic differential, then 8: 4102:(shown in the case of complex dimension 2): 2882: 2844: 1975:. As a result, there is a canonical mapping 1910: 1867: 1615: 1599: 1554: 1547: 1541: 1529: 1487: 1456: 1440: 1428: 5105:says that the Hodge conjecture is true for 4535:defines an element of the cohomology group 4418:{\displaystyle \partial {\bar {\partial }}} 6127:Differential Analysis on Complex Manifolds 5705:is a sheaf of mixed Hodge structures over 5591:which are built from the Hodge structure. 4806:. (Such a linear combination is called an 3101:complex projective manifold, meaning that 1804:{\displaystyle \Delta =d\delta +\delta d.} 162:, integration of differential forms along 123:. In arithmetic situations, the tools of 6146: 5710: 5690: 5662: 5642: 5557: 5556: 5554: 5518: 5512: 5490: 5489: 5474: 5468: 5442: 5422: 5394: 5369: 5365: 5364: 5361: 5325: 5319: 5298: 5294: 5293: 5290: 5268: 5267: 5252: 5246: 5226: 5183: 5159: 5139: 5110: 5083: 5059: 5032: 5026: 5006: 5001: 4994: 4993: 4975: 4969: 4964:may be much smaller than the whole group 4944: 4943: 4925: 4897: 4882: 4877: 4870: 4869: 4851: 4842: 4815: 4791: 4772: 4771: 4769: 4733: 4727: 4705: 4704: 4686: 4680: 4640: 4634: 4612: 4611: 4593: 4587: 4565: 4564: 4546: 4540: 4520: 4497: 4477: 4457: 4442:Algebraic cycles and the Hodge conjecture 4404: 4403: 4398: 3977: 3971: 3935: 3921: 3920: 3902: 3896: 3846: 3811: 3722: 3703: 3675: 3669: 3586: 3548: 3520: 3508: 3470:as a complex manifold, whereas the group 3428: 3406: 3391: 3376: 3370: 3289: 3283: 3260: 3254: 3242: 3220: 3212: 3207: 3056: 3043: 3042: 3030: 3018: 2932: 2931: 2922: 2916: 2915: 2906: 2861: 2855: 2854: 2835: 2834: 2832: 2779: 2773: 2772: 2762: 2756: 2755: 2745: 2735: 2708: 2692: 2675: 2669: 2668: 2663: 2661: 2625: 2597: 2575: 2557: 2513: 2491: 2472: 2466: 2439:{\displaystyle E_{0},E_{1},\ldots ,E_{N}} 2430: 2411: 2398: 2392: 2333: 2328: 2322: 2321: 2305: 2280: 2252: 2246: 2173: 2065: 2038: 2023: 2001: 1996: 1990: 1989: 1980: 1880: 1849: 1844: 1838: 1837: 1834: 1775: 1732: 1704: 1692: 1645: 1633: 1618: 1597: 1557: 1527: 1490: 1450: 1408: 1375: 1357: 1333: 1295: 1289: 1256: 1251: 1238: 1232: 1205: 1199: 1169: 1164: 1158: 1117: 1112: 1099: 1093: 1048: 1038: 1008: 1002: 950: 932: 919: 908: 893: 887: 796: 772: 754: 734: 710: 698: 674: 662: 651:. The de Rham complex is the sequence of 537: 536: 534: 514: 488: 487: 480: 470: 468: 437: 436: 429: 419: 417: 339: 324: 319: 304: 289: 284: 278: 245: 234: 219: 214: 199: 184: 178: 3806:and the cohomology class represented by 57:. The key observation is that, given a 5776: 5925:Griffiths & Harris (1994), p. 594. 4715:{\displaystyle H^{2p}(X,\mathbb {Z} )} 4675:predicts a converse: every element of 4622:{\displaystyle H^{2p}(X,\mathbb {C} )} 4575:{\displaystyle H^{2p}(X,\mathbb {Z} )} 2948:be the orthogonal projection, and let 2157:A variant of the Hodge theorem is the 1684:with respect to these inner products: 5500:{\displaystyle H^{2}(X,\mathbb {Z} )} 5278:{\displaystyle H^{2}(X,\mathbb {Z} )} 4196:For example, every smooth projective 7: 5907:Huybrechts (2005), Corollary 2.6.21. 5898:Huybrechts (2005), Corollary 3.2.12. 5413:of all projective K3 surfaces has a 4430:Hodge theory and extensions such as 119:, it can be applied to questions in 3787:theorem implies that a holomorphic 2732: 2689: 1235: 1096: 1035: 871:). De Rham's theorem says that the 558:must be non-zero. It follows that 509:is positive, so the cup product of 4406: 4400: 3719: 2870: 2698: 2615: 2587: 2565: 2503: 2481: 2372:Hodge theory of elliptic complexes 2329: 2249: 1997: 1898: 1877: 1845: 1777: 1729: 1701: 1566: 1372: 1292: 1026: 1005: 769: 707: 671: 25: 6023:Complex Geometry: An Introduction 5378:{\displaystyle \mathbb {C} ^{20}} 5307:{\displaystyle \mathbb {Z} ^{22}} 5210:of algebraic functions, known as 5134:The Hodge structure of a variety 5960:Principles of Algebraic Geometry 4386:Hodge-Riemann bilinear relations 3966:, we conclude that must lie in 3392: 2039: 1929:The Laplacian appeared first in 1634: 1328:with respect to the volume form 909: 612:The Hodge theory references the 551:{\displaystyle {\bar {\omega }}} 340: 305: 246: 235: 200: 3884:{\displaystyle (p,q)\neq (k,k)} 3485:depends only on the underlying 3136:induces a Riemannian metric on 2810:. Define the elliptic operator 1149:) the inner product induced by 603:Hodge theory for real manifolds 65:, every cohomology class has a 42:, is a method for studying the 5536: 5530: 5494: 5480: 5343: 5337: 5272: 5258: 4998: 4984: 4948: 4934: 4915: 4909: 4887: 4874: 4860: 4844: 4751: 4745: 4709: 4695: 4658: 4652: 4616: 4602: 4569: 4555: 4409: 4013:{\displaystyle H^{n-k,n-k}(X)} 4007: 4001: 3953: 3947: 3925: 3911: 3878: 3866: 3860: 3848: 3767:) is the space of holomorphic 3728: 3709: 3693: 3687: 3626: 3620: 3579: 3576: 3570: 3538: 3532: 3446: 3440: 3396: 3382: 3062: 3049: 3036: 3023: 2928: 2768: 2714: 2701: 2634: 2631: 2618: 2612: 2606: 2603: 2590: 2584: 2581: 2568: 2562: 2525: 2506: 2500: 2497: 2484: 2345: 2339: 2264: 2258: 2115:on the integral cohomology of 2043: 2029: 2016: 2013: 2007: 1892: 1886: 1861: 1855: 1744: 1738: 1725: 1722: 1716: 1657: 1651: 1630: 1611: 1605: 1483: 1477: 1468: 1462: 1425: 1422: 1410: 1387: 1381: 1313:{\displaystyle \Omega ^{k}(M)} 1307: 1301: 1271: 1268: 1262: 1244: 1181: 1175: 1132: 1129: 1123: 1105: 1060: 1054: 1020: 1014: 913: 899: 784: 778: 722: 716: 686: 680: 667: 598:, vol. 22, 1976, pp. 169–192. 542: 493: 442: 344: 330: 309: 295: 242: 239: 225: 204: 190: 88:, and it built on the work of 55:partial differential equations 1: 5889:Wells (2008), Theorem IV.5.2. 5750:Local invariant cycle theorem 4438:of compact Kähler manifolds. 3891:, then we get zero. Because 3657:group, which depends only on 624:. For a non-negative integer 5941:Computing Some Hodge Numbers 5871:Warner (1983), Theorem 6.11. 5787:A glimpse of the de Rham era 5634:variation of Hodge structure 5564:{\displaystyle \mathbb {Z} } 4779:{\displaystyle \mathbb {Z} } 4378:Lefschetz hyperplane theorem 3334:. On a Kähler manifold, the 3295: 3266: 2960:then asserts the following: 1187:{\displaystyle T_{p}^{*}(M)} 396:is necessarily zero because 366:Separately, a 1927 paper of 27:Mathematical manifold theory 5880:Warner (1983), Theorem 6.8. 5021:, even if the Hodge number 4246:For another example, every 1818:. By definition, a form on 986:Choose a Riemannian metric 6210: 6060:Cambridge University Press 5994:Cambridge University Press 5542:{\displaystyle H^{1,1}(X)} 5349:{\displaystyle H^{1,1}(X)} 4757:{\displaystyle H^{p,p}(X)} 4664:{\displaystyle H^{p,p}(X)} 4445: 3130:standard Riemannian metric 3086: 1826:if its Laplacian is zero: 1153:from each cotangent fiber 6139:10.1007/978-0-387-73892-5 3802:of the homology class of 3655:coherent sheaf cohomology 2368:for the de Rham complex. 2111:determines a real-valued 2096:and others in the 1940s. 1352:. Explicitly, given some 982:Operators in Hodge theory 374:. In modern language, if 6068:10.1017/CBO9780511615344 4432:non-abelian Hodge theory 3830:, the homology class of 3111:complex projective space 2454:with a volume form  2073:{\displaystyle \varphi } 1949:on spacetime, viewed as 73:that vanishes under the 67:canonical representative 6092:Warner, Frank (1983) , 5745:Helmholtz decomposition 5103:Lefschetz (1,1)-theorem 5047:{\displaystyle h^{p,p}} 3819:{\displaystyle \alpha } 3795:is in fact algebraic.) 3151:For a complex manifold 2366:Helmholtz decomposition 1964:Riemannian manifold is 1767:on forms is defined by 1341:{\displaystyle \sigma } 522:{\displaystyle \omega } 5719: 5699: 5671: 5651: 5589:intermediate Jacobians 5565: 5543: 5501: 5457: 5431: 5403: 5379: 5350: 5308: 5279: 5235: 5216:transcendental numbers 5192: 5168: 5148: 5125: 5092: 5068: 5048: 5015: 4955: 4824: 4800: 4780: 4758: 4716: 4665: 4623: 4576: 4529: 4506: 4486: 4466: 4419: 4382:hard Lefschetz theorem 4014: 3960: 3885: 3820: 3738: 3636: 3456: 3304: 3122:homogeneous polynomial 3069: 2942: 2892: 2793: 2644: 2543:differential operators 2532: 2440: 2355: 2209: 2074: 2050: 1920: 1805: 1754: 1667: 1576: 1506: 1394: 1342: 1314: 1278: 1218: 1217:{\displaystyle k^{th}} 1188: 1139: 1075: 972: 814: 653:differential operators 600: 552: 523: 503: 452: 354: 257: 6123:Wells Jr., Raymond O. 5760:Hodge-Arakelov theory 5720: 5700: 5672: 5652: 5616:intersection homology 5608:mixed Hodge structure 5566: 5544: 5502: 5458: 5432: 5404: 5380: 5351: 5309: 5280: 5236: 5193: 5169: 5149: 5126: 5093: 5069: 5049: 5016: 4956: 4825: 4801: 4781: 4759: 4717: 4666: 4624: 4577: 4530: 4507: 4487: 4467: 4420: 4015: 3961: 3886: 3821: 3739: 3637: 3457: 3332:holomorphic functions 3317:a C function and the 3305: 3155:and a natural number 3070: 2943: 2893: 2794: 2645: 2533: 2441: 2356: 2210: 2075: 2051: 1921: 1806: 1755: 1668: 1577: 1507: 1395: 1343: 1315: 1279: 1219: 1189: 1140: 1084:The metric yields an 1076: 973: 815: 584: 553: 524: 504: 453: 355: 258: 170:, a bilinear pairing 5709: 5689: 5661: 5641: 5553: 5511: 5467: 5456:{\displaystyle 20-a} 5441: 5421: 5393: 5360: 5318: 5289: 5245: 5225: 5182: 5158: 5138: 5109: 5082: 5058: 5025: 4968: 4841: 4814: 4790: 4768: 4726: 4679: 4633: 4586: 4539: 4519: 4496: 4476: 4456: 4397: 3970: 3895: 3845: 3810: 3747:where Ω denotes the 3668: 3507: 3369: 3206: 3017: 2905: 2831: 2660: 2556: 2465: 2391: 2245: 2172: 2133:general linear group 2064: 1979: 1956:Every harmonic form 1931:mathematical physics 1833: 1774: 1691: 1596: 1526: 1407: 1356: 1332: 1288: 1231: 1198: 1157: 1092: 1001: 886: 661: 533: 513: 467: 416: 408:. Additionally, if 277: 177: 106:projective varieties 98:Riemannian manifolds 5124:{\displaystyle p=1} 4250:has Hodge diamond 3107:complex submanifold 2338: 2159:Hodge decomposition 2006: 1935:Maxwell's equations 1854: 1261: 1174: 1122: 873:singular cohomology 832:exterior derivative 802: 766: 740: 704: 572:Hodge star operator 329: 294: 224: 6148:10338.dmlcz/141778 6019:Huybrechts, Daniel 5952:Griffiths, Phillip 5715: 5695: 5667: 5647: 5600:Mixed Hodge theory 5561: 5539: 5497: 5453: 5427: 5415:countably infinite 5399: 5375: 5346: 5304: 5275: 5231: 5208:definite integrals 5204:algebraic function 5188: 5164: 5144: 5121: 5088: 5064: 5044: 5011: 4951: 4820: 4796: 4776: 4754: 4712: 4661: 4619: 4572: 4525: 4502: 4482: 4462: 4436:fundamental groups 4415: 4207:has Hodge diamond 4010: 3956: 3881: 3816: 3734: 3632: 3452: 3423: 3300: 3065: 2938: 2888: 2806:be the adjoint of 2789: 2787: 2640: 2528: 2436: 2385:elliptic complexes 2351: 2320: 2230:. In terms of the 2205: 2101:finite-dimensional 2070: 2046: 1988: 1916: 1836: 1801: 1750: 1663: 1572: 1502: 1390: 1338: 1310: 1274: 1247: 1214: 1184: 1160: 1145:by extending (see 1135: 1108: 1071: 968: 842:in the sense that 810: 641:differential forms 608:De Rham cohomology 548: 519: 499: 448: 350: 315: 280: 253: 210: 150:published a note, 140:algebraic topology 128:-adic Hodge theory 94:de Rham cohomology 86:algebraic geometry 6158:978-0-387-73891-8 6077:978-0-521-71801-1 6003:978-0-521-35881-1 5823:Ann. of Math. (2) 5793:, working paper, 5718:{\displaystyle X} 5698:{\displaystyle X} 5670:{\displaystyle X} 5650:{\displaystyle X} 5629:Phillip Griffiths 5549:is isomorphic to 5430:{\displaystyle a} 5402:{\displaystyle X} 5356:is isomorphic to 5285:is isomorphic to 5234:{\displaystyle X} 5206:. In particular, 5191:{\displaystyle X} 5167:{\displaystyle X} 5147:{\displaystyle X} 5091:{\displaystyle X} 5067:{\displaystyle X} 5009: 4885: 4823:{\displaystyle X} 4799:{\displaystyle X} 4528:{\displaystyle p} 4505:{\displaystyle X} 4485:{\displaystyle Y} 4465:{\displaystyle X} 4412: 4390:Kähler identities 4324: 4323: 4244: 4243: 4194: 4193: 4069:complex conjugate 3487:topological space 3402: 3298: 3269: 2971:are well-defined. 1933:. In particular, 994:and recall that: 963: 803: 767: 741: 705: 545: 496: 478: 445: 427: 406:Riemann relations 368:Solomon Lefschetz 322: 287: 217: 156:de Rham's theorem 71:differential form 59:Riemannian metric 44:cohomology groups 16:(Redirected from 6201: 6169: 6150: 6118: 6088: 6047: 6014: 5981: 5947: 5946: 5926: 5923: 5917: 5914: 5908: 5905: 5899: 5896: 5890: 5887: 5881: 5878: 5872: 5869: 5863: 5853: 5847: 5846: 5818: 5812: 5811: 5810: 5809: 5803: 5797:, archived from 5792: 5781: 5735:Potential theory 5724: 5722: 5721: 5716: 5704: 5702: 5701: 5696: 5676: 5674: 5673: 5668: 5656: 5654: 5653: 5648: 5570: 5568: 5567: 5562: 5560: 5548: 5546: 5545: 5540: 5529: 5528: 5506: 5504: 5503: 5498: 5493: 5479: 5478: 5462: 5460: 5459: 5454: 5436: 5434: 5433: 5428: 5408: 5406: 5405: 5400: 5384: 5382: 5381: 5376: 5374: 5373: 5368: 5355: 5353: 5352: 5347: 5336: 5335: 5313: 5311: 5310: 5305: 5303: 5302: 5297: 5284: 5282: 5281: 5276: 5271: 5257: 5256: 5240: 5238: 5237: 5232: 5197: 5195: 5194: 5189: 5173: 5171: 5170: 5165: 5153: 5151: 5150: 5145: 5130: 5128: 5127: 5122: 5097: 5095: 5094: 5089: 5073: 5071: 5070: 5065: 5053: 5051: 5050: 5045: 5043: 5042: 5020: 5018: 5017: 5012: 5010: 5007: 5005: 4997: 4983: 4982: 4960: 4958: 4957: 4952: 4947: 4933: 4932: 4908: 4907: 4886: 4883: 4881: 4873: 4859: 4858: 4829: 4827: 4826: 4821: 4805: 4803: 4802: 4797: 4785: 4783: 4782: 4777: 4775: 4763: 4761: 4760: 4755: 4744: 4743: 4721: 4719: 4718: 4713: 4708: 4694: 4693: 4673:Hodge conjecture 4670: 4668: 4667: 4662: 4651: 4650: 4628: 4626: 4625: 4620: 4615: 4601: 4600: 4581: 4579: 4578: 4573: 4568: 4554: 4553: 4534: 4532: 4531: 4526: 4511: 4509: 4508: 4503: 4491: 4489: 4488: 4483: 4471: 4469: 4468: 4463: 4448:Hodge conjecture 4424: 4422: 4421: 4416: 4414: 4413: 4405: 4372: 4362: 4253: 4252: 4210: 4209: 4105: 4104: 4088: 4058: 4019: 4017: 4016: 4011: 4000: 3999: 3965: 3963: 3962: 3957: 3946: 3945: 3924: 3910: 3909: 3890: 3888: 3887: 3882: 3828:Poincaré duality 3825: 3823: 3822: 3817: 3791:-form on all of 3743: 3741: 3740: 3735: 3727: 3726: 3708: 3707: 3686: 3685: 3641: 3639: 3638: 3633: 3619: 3618: 3617: 3600: 3569: 3568: 3567: 3556: 3531: 3530: 3484: 3461: 3459: 3458: 3453: 3439: 3438: 3422: 3395: 3381: 3380: 3350:Kähler manifold 3345: 3309: 3307: 3306: 3301: 3299: 3294: 3293: 3284: 3270: 3265: 3264: 3255: 3247: 3246: 3225: 3224: 3198: 3183: 3074: 3072: 3071: 3066: 3061: 3060: 3048: 3047: 3035: 3034: 2954:Green's operator 2947: 2945: 2944: 2939: 2937: 2936: 2927: 2926: 2921: 2920: 2897: 2895: 2894: 2889: 2866: 2865: 2860: 2859: 2840: 2839: 2823: 2798: 2796: 2795: 2790: 2788: 2784: 2783: 2778: 2777: 2767: 2766: 2761: 2760: 2750: 2749: 2740: 2739: 2713: 2712: 2697: 2696: 2680: 2679: 2674: 2673: 2649: 2647: 2646: 2641: 2630: 2629: 2602: 2601: 2580: 2579: 2537: 2535: 2534: 2529: 2524: 2523: 2496: 2495: 2477: 2476: 2445: 2443: 2442: 2437: 2435: 2434: 2416: 2415: 2403: 2402: 2360: 2358: 2357: 2352: 2337: 2332: 2327: 2326: 2316: 2315: 2291: 2290: 2257: 2256: 2229: 2214: 2212: 2211: 2206: 2149: 2079: 2077: 2076: 2071: 2055: 2053: 2052: 2047: 2042: 2028: 2027: 2005: 2000: 1995: 1994: 1974: 1953:of dimension 4. 1948: 1925: 1923: 1922: 1917: 1885: 1884: 1853: 1848: 1843: 1842: 1810: 1808: 1807: 1802: 1759: 1757: 1756: 1751: 1737: 1736: 1715: 1714: 1678:adjoint operator 1672: 1670: 1669: 1664: 1650: 1649: 1637: 1623: 1622: 1581: 1579: 1578: 1573: 1562: 1561: 1511: 1509: 1508: 1503: 1495: 1494: 1455: 1454: 1399: 1397: 1396: 1391: 1380: 1379: 1348:associated with 1347: 1345: 1344: 1339: 1319: 1317: 1316: 1311: 1300: 1299: 1283: 1281: 1280: 1275: 1260: 1255: 1243: 1242: 1225:exterior product 1223: 1221: 1220: 1215: 1213: 1212: 1193: 1191: 1190: 1185: 1173: 1168: 1144: 1142: 1141: 1136: 1121: 1116: 1104: 1103: 1080: 1078: 1077: 1072: 1067: 1063: 1053: 1052: 1043: 1042: 1013: 1012: 977: 975: 974: 969: 964: 962: 961: 960: 938: 937: 936: 920: 912: 898: 897: 870: 863: 819: 817: 816: 811: 801: 800: 787: 777: 776: 765: 764: 745: 739: 738: 725: 715: 714: 703: 702: 689: 679: 678: 580:Kunihiko Kodaira 557: 555: 554: 549: 547: 546: 538: 528: 526: 525: 520: 508: 506: 505: 500: 498: 497: 489: 479: 471: 457: 455: 454: 449: 447: 446: 438: 428: 420: 359: 357: 356: 351: 343: 328: 323: 320: 308: 293: 288: 285: 262: 260: 259: 254: 249: 238: 223: 218: 215: 203: 189: 188: 110:algebraic cycles 102:Kähler manifolds 21: 6209: 6208: 6204: 6203: 6202: 6200: 6199: 6198: 6184: 6183: 6181: 6159: 6121: 6108: 6091: 6078: 6050: 6037: 6017: 6004: 5986:Hodge, W. V. D. 5984: 5970: 5950: 5944: 5938:Arapura, Donu, 5937: 5934: 5929: 5924: 5920: 5915: 5911: 5906: 5902: 5897: 5893: 5888: 5884: 5879: 5875: 5870: 5866: 5854: 5850: 5835:10.2307/1968379 5820: 5819: 5815: 5807: 5805: 5801: 5790: 5783: 5782: 5778: 5774: 5755:Arakelov theory 5731: 5707: 5706: 5687: 5686: 5659: 5658: 5639: 5638: 5631:'s notion of a 5602:, developed by 5597: 5595:Generalizations 5577:Torelli theorem 5551: 5550: 5514: 5509: 5508: 5470: 5465: 5464: 5439: 5438: 5419: 5418: 5391: 5390: 5363: 5358: 5357: 5321: 5316: 5315: 5292: 5287: 5286: 5248: 5243: 5242: 5223: 5222: 5180: 5179: 5156: 5155: 5136: 5135: 5107: 5106: 5080: 5079: 5076:Hodge structure 5056: 5055: 5028: 5023: 5022: 4971: 4966: 4965: 4921: 4893: 4847: 4839: 4838: 4812: 4811: 4808:algebraic cycle 4788: 4787: 4766: 4765: 4729: 4724: 4723: 4682: 4677: 4676: 4636: 4631: 4630: 4589: 4584: 4583: 4542: 4537: 4536: 4517: 4516: 4494: 4493: 4474: 4473: 4454: 4453: 4450: 4444: 4395: 4394: 4370: 4364: 4354: 4344: 4080: 4050: 3973: 3968: 3967: 3931: 3898: 3893: 3892: 3843: 3842: 3808: 3807: 3779:is projective, 3759:. For example, 3751:of holomorphic 3718: 3699: 3671: 3666: 3665: 3610: 3593: 3582: 3560: 3549: 3544: 3516: 3505: 3504: 3471: 3424: 3372: 3367: 3366: 3335: 3330: 3323: 3285: 3256: 3238: 3216: 3204: 3203: 3186: 3173: 3146:Kähler manifold 3091: 3089:Hodge structure 3085: 3052: 3026: 3015: 3014: 2914: 2903: 2902: 2853: 2829: 2828: 2811: 2786: 2785: 2771: 2754: 2741: 2731: 2724: 2718: 2717: 2704: 2688: 2681: 2667: 2658: 2657: 2621: 2593: 2571: 2554: 2553: 2509: 2487: 2468: 2463: 2462: 2458:. Suppose that 2426: 2407: 2394: 2389: 2388: 2374: 2301: 2276: 2248: 2243: 2242: 2238:decomposition: 2223: 2170: 2169: 2135: 2062: 2061: 2019: 1977: 1976: 1969: 1968:, meaning that 1951:Minkowski space 1942: 1876: 1831: 1830: 1772: 1771: 1728: 1700: 1689: 1688: 1641: 1614: 1594: 1593: 1553: 1524: 1523: 1486: 1446: 1405: 1404: 1371: 1354: 1353: 1330: 1329: 1291: 1286: 1285: 1234: 1229: 1228: 1201: 1196: 1195: 1155: 1154: 1095: 1090: 1089: 1044: 1034: 1033: 1029: 1004: 999: 998: 984: 946: 939: 928: 921: 889: 884: 883: 865: 861: 852: 843: 840:cochain complex 828: 792: 768: 750: 730: 706: 694: 670: 659: 658: 622:smooth manifold 614:de Rham complex 610: 605: 568:Riemann surface 531: 530: 511: 510: 465: 464: 414: 413: 387: 380: 275: 274: 268:perfect pairing 180: 175: 174: 160:Stokes' theorem 136: 117:complex numbers 90:Georges de Rham 48:smooth manifold 28: 23: 22: 15: 12: 11: 5: 6207: 6205: 6197: 6196: 6186: 6185: 6179: 6178: 6171: 6170: 6157: 6119: 6106: 6089: 6076: 6052:Voisin, Claire 6048: 6035: 6015: 6002: 5982: 5968: 5956:Harris, Joseph 5948: 5933: 5930: 5928: 5927: 5918: 5909: 5900: 5891: 5882: 5873: 5864: 5856:Michael Atiyah 5848: 5829:(1): 342–354. 5813: 5775: 5773: 5770: 5769: 5768: 5762: 5757: 5752: 5747: 5742: 5737: 5730: 5727: 5714: 5694: 5679:period mapping 5666: 5646: 5621:Morihiko Saito 5604:Pierre Deligne 5596: 5593: 5559: 5538: 5535: 5532: 5527: 5524: 5521: 5517: 5496: 5492: 5488: 5485: 5482: 5477: 5473: 5452: 5449: 5446: 5437:has dimension 5426: 5398: 5372: 5367: 5345: 5342: 5339: 5334: 5331: 5328: 5324: 5301: 5296: 5274: 5270: 5266: 5263: 5260: 5255: 5251: 5230: 5187: 5163: 5143: 5120: 5117: 5114: 5087: 5063: 5041: 5038: 5035: 5031: 5004: 5000: 4996: 4992: 4989: 4986: 4981: 4978: 4974: 4962: 4961: 4950: 4946: 4942: 4939: 4936: 4931: 4928: 4924: 4920: 4917: 4914: 4911: 4906: 4903: 4900: 4896: 4892: 4889: 4880: 4876: 4872: 4868: 4865: 4862: 4857: 4854: 4850: 4846: 4819: 4795: 4774: 4753: 4750: 4747: 4742: 4739: 4736: 4732: 4711: 4707: 4703: 4700: 4697: 4692: 4689: 4685: 4660: 4657: 4654: 4649: 4646: 4643: 4639: 4618: 4614: 4610: 4607: 4604: 4599: 4596: 4592: 4571: 4567: 4563: 4560: 4557: 4552: 4549: 4545: 4524: 4501: 4481: 4461: 4446:Main article: 4443: 4440: 4411: 4408: 4402: 4368: 4363:and hence has 4338: 4322: 4321: 4319: 4317: 4314: 4312: 4309: 4308: 4306: 4303: 4301: 4298: 4295: 4294: 4291: 4289: 4286: 4284: 4280: 4279: 4277: 4274: 4272: 4269: 4266: 4265: 4263: 4261: 4258: 4256: 4242: 4241: 4239: 4236: 4233: 4232: 4227: 4225: 4219: 4218: 4216: 4213: 4192: 4191: 4189: 4187: 4182: 4180: 4177: 4176: 4174: 4169: 4167: 4162: 4159: 4158: 4153: 4151: 4146: 4144: 4138: 4137: 4135: 4130: 4128: 4123: 4120: 4119: 4117: 4115: 4110: 4108: 4048:Hodge symmetry 4009: 4006: 4003: 3998: 3995: 3992: 3989: 3986: 3983: 3980: 3976: 3955: 3952: 3949: 3944: 3941: 3938: 3934: 3930: 3927: 3923: 3919: 3916: 3913: 3908: 3905: 3901: 3880: 3877: 3874: 3871: 3868: 3865: 3862: 3859: 3856: 3853: 3850: 3815: 3745: 3744: 3733: 3730: 3725: 3721: 3717: 3714: 3711: 3706: 3702: 3698: 3695: 3692: 3689: 3684: 3681: 3678: 3674: 3643: 3642: 3631: 3628: 3625: 3622: 3616: 3613: 3609: 3606: 3603: 3599: 3596: 3592: 3589: 3585: 3581: 3578: 3575: 3572: 3566: 3563: 3559: 3555: 3552: 3547: 3543: 3540: 3537: 3534: 3529: 3526: 3523: 3519: 3515: 3512: 3463: 3462: 3451: 3448: 3445: 3442: 3437: 3434: 3431: 3427: 3421: 3418: 3415: 3412: 3409: 3405: 3401: 3398: 3394: 3390: 3387: 3384: 3379: 3375: 3328: 3321: 3311: 3310: 3297: 3292: 3288: 3282: 3279: 3276: 3273: 3268: 3263: 3259: 3253: 3250: 3245: 3241: 3237: 3234: 3231: 3228: 3223: 3219: 3215: 3211: 3118:Chow's theorem 3087:Main article: 3084: 3081: 3077: 3076: 3064: 3059: 3055: 3051: 3046: 3041: 3038: 3033: 3029: 3025: 3022: 3011: 2991: 2972: 2935: 2930: 2925: 2919: 2913: 2910: 2899: 2898: 2887: 2884: 2881: 2878: 2875: 2872: 2869: 2864: 2858: 2852: 2849: 2846: 2843: 2838: 2800: 2799: 2782: 2776: 2770: 2765: 2759: 2753: 2748: 2744: 2738: 2734: 2730: 2727: 2725: 2723: 2720: 2719: 2716: 2711: 2707: 2703: 2700: 2695: 2691: 2687: 2684: 2682: 2678: 2672: 2666: 2665: 2651: 2650: 2639: 2636: 2633: 2628: 2624: 2620: 2617: 2614: 2611: 2608: 2605: 2600: 2596: 2592: 2589: 2586: 2583: 2578: 2574: 2570: 2567: 2564: 2561: 2539: 2538: 2527: 2522: 2519: 2516: 2512: 2508: 2505: 2502: 2499: 2494: 2490: 2486: 2483: 2480: 2475: 2471: 2448:vector bundles 2433: 2429: 2425: 2422: 2419: 2414: 2410: 2406: 2401: 2397: 2373: 2370: 2362: 2361: 2350: 2347: 2344: 2341: 2336: 2331: 2325: 2319: 2314: 2311: 2308: 2304: 2300: 2297: 2294: 2289: 2286: 2283: 2279: 2275: 2272: 2269: 2266: 2263: 2260: 2255: 2251: 2216: 2215: 2204: 2201: 2198: 2195: 2192: 2189: 2186: 2183: 2180: 2177: 2125:isometry group 2069: 2045: 2041: 2037: 2034: 2031: 2026: 2022: 2018: 2015: 2012: 2009: 2004: 1999: 1993: 1987: 1984: 1927: 1926: 1915: 1912: 1909: 1906: 1903: 1900: 1897: 1894: 1891: 1888: 1883: 1879: 1875: 1872: 1869: 1866: 1863: 1860: 1857: 1852: 1847: 1841: 1812: 1811: 1800: 1797: 1794: 1791: 1788: 1785: 1782: 1779: 1761: 1760: 1749: 1746: 1743: 1740: 1735: 1731: 1727: 1724: 1721: 1718: 1713: 1710: 1707: 1703: 1699: 1696: 1674: 1673: 1662: 1659: 1656: 1653: 1648: 1644: 1640: 1636: 1632: 1629: 1626: 1621: 1617: 1613: 1610: 1607: 1604: 1601: 1583: 1582: 1571: 1568: 1565: 1560: 1556: 1552: 1549: 1546: 1543: 1540: 1537: 1534: 1531: 1513: 1512: 1501: 1498: 1493: 1489: 1485: 1482: 1479: 1476: 1473: 1470: 1467: 1464: 1461: 1458: 1453: 1449: 1445: 1442: 1439: 1436: 1433: 1430: 1427: 1424: 1421: 1418: 1415: 1412: 1389: 1386: 1383: 1378: 1374: 1370: 1367: 1364: 1361: 1337: 1309: 1306: 1303: 1298: 1294: 1273: 1270: 1267: 1264: 1259: 1254: 1250: 1246: 1241: 1237: 1211: 1208: 1204: 1183: 1180: 1177: 1172: 1167: 1163: 1147:Gramian matrix 1134: 1131: 1128: 1125: 1120: 1115: 1111: 1107: 1102: 1098: 1088:on each fiber 1082: 1081: 1070: 1066: 1062: 1059: 1056: 1051: 1047: 1041: 1037: 1032: 1028: 1025: 1022: 1019: 1016: 1011: 1007: 983: 980: 979: 978: 967: 959: 956: 953: 949: 945: 942: 935: 931: 927: 924: 918: 915: 911: 907: 904: 901: 896: 892: 864:(also written 857: 847: 826: 821: 820: 809: 806: 799: 795: 790: 786: 783: 780: 775: 771: 763: 760: 757: 753: 748: 744: 737: 733: 728: 724: 721: 718: 713: 709: 701: 697: 692: 688: 685: 682: 677: 673: 669: 666: 609: 606: 604: 601: 544: 541: 518: 495: 492: 486: 483: 477: 474: 444: 441: 435: 432: 426: 423: 385: 378: 361: 360: 349: 346: 342: 338: 335: 332: 327: 318: 314: 311: 307: 303: 300: 297: 292: 283: 264: 263: 252: 248: 244: 241: 237: 233: 230: 227: 222: 213: 209: 206: 202: 198: 195: 192: 187: 183: 135: 132: 40:W. V. D. Hodge 38:, named after 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 6206: 6195: 6192: 6191: 6189: 6182: 6176: 6173: 6172: 6168: 6164: 6160: 6154: 6149: 6144: 6140: 6136: 6132: 6128: 6124: 6120: 6117: 6113: 6109: 6107:0-387-90894-3 6103: 6099: 6095: 6090: 6087: 6083: 6079: 6073: 6069: 6065: 6061: 6057: 6053: 6049: 6046: 6042: 6038: 6036:3-540-21290-6 6032: 6028: 6024: 6020: 6016: 6013: 6009: 6005: 5999: 5995: 5991: 5987: 5983: 5979: 5975: 5971: 5969:0-471-05059-8 5965: 5961: 5957: 5953: 5949: 5943: 5942: 5936: 5935: 5931: 5922: 5919: 5913: 5910: 5904: 5901: 5895: 5892: 5886: 5883: 5877: 5874: 5868: 5865: 5861: 5857: 5852: 5849: 5844: 5840: 5836: 5832: 5828: 5824: 5817: 5814: 5804:on 2023-12-04 5800: 5796: 5789: 5788: 5780: 5777: 5771: 5766: 5763: 5761: 5758: 5756: 5753: 5751: 5748: 5746: 5743: 5741: 5740:Serre duality 5738: 5736: 5733: 5732: 5728: 5726: 5712: 5692: 5684: 5683:Hodge modules 5680: 5664: 5644: 5636: 5635: 5630: 5625: 5622: 5618: 5617: 5611: 5609: 5605: 5601: 5594: 5592: 5590: 5586: 5582: 5578: 5572: 5533: 5525: 5522: 5519: 5515: 5486: 5483: 5475: 5471: 5450: 5447: 5444: 5424: 5416: 5412: 5396: 5388: 5387:Picard number 5370: 5340: 5332: 5329: 5326: 5322: 5299: 5264: 5261: 5253: 5249: 5228: 5219: 5217: 5213: 5209: 5205: 5201: 5185: 5177: 5161: 5141: 5132: 5118: 5115: 5112: 5104: 5099: 5085: 5077: 5061: 5039: 5036: 5033: 5029: 5002: 4990: 4987: 4979: 4976: 4972: 4940: 4937: 4929: 4926: 4922: 4918: 4912: 4904: 4901: 4898: 4894: 4890: 4878: 4866: 4863: 4855: 4852: 4848: 4837: 4836: 4835: 4831: 4817: 4809: 4793: 4748: 4740: 4737: 4734: 4730: 4701: 4698: 4690: 4687: 4683: 4674: 4655: 4647: 4644: 4641: 4637: 4608: 4605: 4597: 4594: 4590: 4561: 4558: 4550: 4547: 4543: 4522: 4515: 4499: 4479: 4459: 4449: 4441: 4439: 4437: 4433: 4428: 4426: 4391: 4387: 4383: 4379: 4374: 4367: 4361: 4357: 4352: 4351:diffeomorphic 4348: 4342: 4337: 4333: 4329: 4328:Betti numbers 4320: 4318: 4315: 4313: 4311: 4310: 4307: 4304: 4302: 4299: 4297: 4296: 4292: 4290: 4287: 4285: 4282: 4281: 4278: 4275: 4273: 4270: 4268: 4267: 4264: 4262: 4259: 4257: 4255: 4254: 4251: 4249: 4240: 4237: 4235: 4234: 4231: 4228: 4226: 4224: 4221: 4220: 4217: 4214: 4212: 4211: 4208: 4206: 4203: 4199: 4190: 4188: 4186: 4183: 4181: 4179: 4178: 4175: 4173: 4170: 4168: 4166: 4163: 4161: 4160: 4157: 4154: 4152: 4150: 4147: 4145: 4143: 4140: 4139: 4136: 4134: 4131: 4129: 4127: 4124: 4122: 4121: 4118: 4116: 4114: 4111: 4109: 4107: 4106: 4103: 4101: 4100: 4099:Hodge diamond 4094: 4092: 4091:Serre duality 4087: 4083: 4078: 4074: 4070: 4066: 4062: 4057: 4053: 4049: 4045: 4041: 4037: 4033: 4029: 4026: 4021: 4004: 3996: 3993: 3990: 3987: 3984: 3981: 3978: 3974: 3950: 3942: 3939: 3936: 3932: 3928: 3917: 3914: 3906: 3903: 3899: 3875: 3872: 3869: 3863: 3857: 3854: 3851: 3839: 3837: 3833: 3829: 3813: 3805: 3801: 3796: 3794: 3790: 3786: 3782: 3778: 3774: 3770: 3766: 3762: 3758: 3754: 3750: 3731: 3723: 3715: 3712: 3704: 3700: 3696: 3690: 3682: 3679: 3676: 3672: 3664: 3663: 3662: 3660: 3656: 3652: 3648: 3629: 3623: 3614: 3611: 3607: 3604: 3601: 3597: 3594: 3590: 3587: 3583: 3573: 3564: 3561: 3557: 3553: 3550: 3545: 3541: 3535: 3527: 3524: 3521: 3517: 3513: 3510: 3503: 3502: 3501: 3499: 3494: 3492: 3488: 3482: 3478: 3474: 3469: 3449: 3443: 3435: 3432: 3429: 3425: 3419: 3416: 3413: 3410: 3407: 3403: 3399: 3388: 3385: 3377: 3373: 3365: 3364: 3363: 3361: 3357: 3353: 3349: 3343: 3339: 3333: 3327: 3320: 3316: 3290: 3286: 3280: 3277: 3274: 3271: 3261: 3257: 3251: 3248: 3243: 3239: 3235: 3232: 3229: 3226: 3221: 3217: 3213: 3209: 3202: 3201: 3200: 3197: 3193: 3189: 3184: 3181: 3177: 3169: 3165: 3162: 3158: 3154: 3149: 3147: 3143: 3139: 3135: 3131: 3127: 3124:equations on 3123: 3119: 3115: 3112: 3108: 3104: 3100: 3096: 3090: 3082: 3080: 3057: 3053: 3039: 3031: 3027: 3020: 3012: 3010: 3006: 3003: 2999: 2995: 2992: 2989: 2985: 2981: 2977: 2973: 2970: 2966: 2963: 2962: 2961: 2959: 2958:Hodge theorem 2955: 2951: 2923: 2911: 2908: 2885: 2879: 2876: 2873: 2867: 2862: 2850: 2847: 2841: 2827: 2826: 2825: 2822: 2819: 2815: 2809: 2805: 2780: 2763: 2751: 2746: 2742: 2736: 2728: 2726: 2721: 2709: 2705: 2693: 2685: 2683: 2676: 2656: 2655: 2654: 2637: 2626: 2622: 2609: 2598: 2594: 2576: 2572: 2559: 2552: 2551: 2550: 2548: 2544: 2520: 2517: 2514: 2510: 2492: 2488: 2478: 2473: 2469: 2461: 2460: 2459: 2457: 2453: 2449: 2431: 2427: 2423: 2420: 2417: 2412: 2408: 2404: 2399: 2395: 2386: 2382: 2378: 2371: 2369: 2367: 2348: 2342: 2334: 2317: 2312: 2309: 2306: 2302: 2298: 2295: 2292: 2287: 2284: 2281: 2277: 2273: 2270: 2267: 2261: 2253: 2241: 2240: 2239: 2237: 2233: 2227: 2222:is harmonic: 2221: 2202: 2199: 2196: 2193: 2190: 2187: 2184: 2181: 2178: 2175: 2168: 2167: 2166: 2164: 2160: 2155: 2153: 2147: 2143: 2139: 2134: 2130: 2126: 2122: 2118: 2114: 2113:inner product 2110: 2106: 2102: 2097: 2095: 2091: 2087: 2083: 2067: 2059: 2058:Hodge theorem 2035: 2032: 2024: 2020: 2010: 2002: 1985: 1982: 1972: 1967: 1963: 1959: 1954: 1952: 1946: 1940: 1936: 1932: 1913: 1907: 1904: 1901: 1895: 1889: 1881: 1873: 1870: 1864: 1858: 1850: 1829: 1828: 1827: 1825: 1821: 1817: 1798: 1795: 1792: 1789: 1786: 1783: 1780: 1770: 1769: 1768: 1766: 1747: 1741: 1733: 1719: 1711: 1708: 1705: 1697: 1694: 1687: 1686: 1685: 1683: 1679: 1676:Consider the 1660: 1654: 1646: 1642: 1638: 1627: 1624: 1619: 1608: 1602: 1592: 1591: 1590: 1588: 1569: 1563: 1558: 1550: 1544: 1538: 1535: 1532: 1522: 1521: 1520: 1518: 1499: 1496: 1491: 1480: 1474: 1471: 1465: 1459: 1451: 1447: 1443: 1437: 1434: 1431: 1419: 1416: 1413: 1403: 1402: 1401: 1384: 1376: 1368: 1365: 1362: 1359: 1351: 1335: 1327: 1323: 1304: 1296: 1265: 1257: 1252: 1248: 1239: 1226: 1209: 1206: 1202: 1178: 1170: 1165: 1161: 1152: 1148: 1126: 1118: 1113: 1109: 1100: 1087: 1086:inner product 1068: 1064: 1057: 1049: 1045: 1039: 1030: 1023: 1017: 1009: 997: 996: 995: 993: 989: 981: 965: 957: 954: 951: 947: 943: 940: 933: 929: 925: 922: 916: 905: 902: 894: 890: 882: 881: 880: 878: 874: 868: 860: 856: 850: 846: 841: 838:). This is a 837: 833: 829: 807: 804: 797: 793: 788: 781: 773: 761: 758: 755: 751: 746: 742: 735: 731: 726: 719: 711: 699: 695: 690: 683: 675: 664: 657: 656: 655: 654: 650: 646: 642: 638: 635: 631: 627: 623: 619: 615: 607: 602: 599: 597: 593: 588: 583: 581: 577: 573: 569: 563: 561: 539: 516: 490: 484: 481: 475: 472: 462: 439: 433: 430: 424: 421: 411: 407: 403: 399: 395: 394:wedge product 392:, then their 391: 384: 377: 373: 369: 364: 347: 336: 333: 325: 316: 312: 301: 298: 290: 281: 273: 272: 271: 269: 250: 231: 228: 220: 211: 207: 196: 193: 185: 181: 173: 172: 171: 169: 165: 161: 157: 153: 149: 145: 141: 138:The field of 133: 131: 129: 127: 122: 121:number theory 118: 113: 111: 107: 103: 99: 95: 91: 87: 82: 80: 76: 72: 68: 64: 60: 56: 52: 49: 45: 41: 37: 33: 19: 18:Harmonic form 6194:Hodge theory 6180: 6126: 6093: 6055: 6022: 5989: 5959: 5940: 5921: 5912: 5903: 5894: 5885: 5876: 5867: 5859: 5851: 5826: 5822: 5816: 5806:, retrieved 5799:the original 5786: 5779: 5657:varies when 5632: 5626: 5614: 5612: 5599: 5598: 5573: 5411:moduli space 5241:, the group 5220: 5133: 5100: 5075: 4963: 4832: 4807: 4672: 4451: 4429: 4375: 4365: 4359: 4355: 4347:Hopf surface 4340: 4335: 4331: 4325: 4245: 4229: 4222: 4204: 4195: 4184: 4171: 4164: 4155: 4148: 4141: 4132: 4125: 4112: 4098: 4095: 4085: 4081: 4076: 4072: 4064: 4060: 4055: 4051: 4047: 4043: 4039: 4035: 4031: 4027: 4025:Hodge number 4024: 4022: 3840: 3835: 3831: 3803: 3797: 3792: 3788: 3776: 3772: 3768: 3764: 3760: 3756: 3752: 3746: 3658: 3650: 3646: 3644: 3495: 3490: 3480: 3476: 3472: 3467: 3464: 3359: 3351: 3341: 3337: 3325: 3318: 3314: 3312: 3195: 3191: 3187: 3179: 3175: 3167: 3163: 3156: 3152: 3150: 3141: 3137: 3133: 3125: 3113: 3105:is a closed 3102: 3094: 3092: 3078: 3008: 3004: 3001: 2997: 2993: 2987: 2983: 2979: 2975: 2968: 2964: 2957: 2949: 2900: 2820: 2817: 2813: 2807: 2803: 2801: 2652: 2540: 2455: 2451: 2375: 2363: 2231: 2225: 2219: 2217: 2162: 2158: 2156: 2154:is finite). 2145: 2141: 2137: 2128: 2116: 2108: 2098: 2085: 2081: 2060:states that 2057: 1970: 1957: 1955: 1944: 1938: 1928: 1823: 1819: 1815: 1813: 1762: 1681: 1675: 1586: 1584: 1516: 1514: 1349: 1325: 1324:-forms over 1321: 1150: 1083: 991: 987: 985: 876: 866: 858: 854: 848: 844: 835: 830:denotes the 824: 822: 648: 644: 637:vector space 629: 625: 617: 611: 595: 592:M. F. Atiyah 589: 585: 576:Hermann Weyl 564: 559: 460: 409: 397: 389: 382: 375: 365: 362: 265: 167: 151: 137: 125: 114: 83: 78: 62: 50: 36:Hodge theory 35: 29: 5765:ddbar lemma 5178:classes in 4514:codimension 4349:, which is 3800:cap product 3498:cup product 2956:for Δ. The 2541:are linear 402:cup product 148:Élie Cartan 32:mathematics 5932:References 5808:2018-10-15 5619:. Namely, 5581:Chow group 4384:, and the 4248:K3 surface 3771:-forms on 3755:-forms on 3645:The piece 3356:cohomology 2545:acting on 2236:direct sum 1941:such that 643:of degree 639:of smooth 144:cohomology 6177:on GitHub 6125:(2008) , 6054:(2007) , 5958:(1994) . 5585:cycle map 5448:− 5214:, can be 4919:⊆ 4891:∩ 4410:¯ 4407:∂ 4401:∂ 4067:) is the 4059:(because 3994:− 3982:− 3864:≠ 3814:α 3720:Ω 3697:≅ 3580:→ 3542:× 3514:: 3511:⌣ 3404:⨁ 3296:¯ 3278:∧ 3275:⋯ 3272:∧ 3267:¯ 3249:∧ 3233:∧ 3230:⋯ 3227:∧ 3172:forms of 3166:-form on 3040:≅ 2929:→ 2924:∙ 2871:Δ 2868:∣ 2863:∙ 2851:∈ 2781:∙ 2769:→ 2764:∙ 2733:⨁ 2699:Γ 2690:⨁ 2677:∙ 2635:→ 2616:Γ 2613:→ 2610:⋯ 2607:→ 2588:Γ 2585:→ 2566:Γ 2563:→ 2504:Γ 2501:→ 2482:Γ 2421:… 2330:Δ 2318:⊕ 2303:δ 2299:⁡ 2293:⊕ 2285:− 2274:⁡ 2268:≅ 2250:Ω 2218:in which 2200:γ 2194:β 2191:δ 2185:α 2176:ω 2068:φ 2017:→ 1998:Δ 1983:φ 1902:α 1899:Δ 1896:∣ 1878:Ω 1874:∈ 1871:α 1846:Δ 1793:δ 1787:δ 1778:Δ 1765:Laplacian 1763:Then the 1730:Ω 1726:→ 1702:Ω 1695:δ 1639:∈ 1631:→ 1616:‖ 1603:ω 1600:‖ 1567:∞ 1555:‖ 1551:ω 1548:‖ 1542:⟩ 1539:ω 1533:ω 1530:⟨ 1497:σ 1488:⟩ 1475:τ 1460:ω 1457:⟨ 1448:∫ 1441:⟩ 1438:τ 1432:ω 1429:⟨ 1426:↦ 1420:τ 1414:ω 1373:Ω 1369:∈ 1366:τ 1360:ω 1336:σ 1293:Ω 1258:∗ 1236:⋀ 1171:∗ 1119:∗ 1097:⋀ 1050:∗ 1036:⋀ 1027:Γ 1006:Ω 955:− 944:⁡ 926:⁡ 917:≅ 770:Ω 759:− 743:⋯ 708:Ω 672:Ω 668:→ 632:) be the 543:¯ 540:ω 517:ω 494:¯ 491:ω 485:∧ 482:ω 473:− 443:¯ 440:ω 434:∧ 431:ω 422:− 313:≅ 243:→ 208:× 75:Laplacian 6188:Category 6131:Springer 6098:Springer 6027:Springer 6021:(2005), 5988:(1941), 5729:See also 5200:calculus 5176:homology 4392:and the 3615:′ 3598:′ 3565:′ 3554:′ 3159:, every 3109:of some 2802:and let 2383:defined 2090:elliptic 1824:harmonic 1400:we have 789:→ 747:→ 727:→ 691:→ 628:, let Ω( 164:singular 79:harmonic 6167:2359489 6116:0722297 6086:1967689 6045:2093043 6012:0003947 5978:0507725 5843:1968379 5212:periods 5008:torsion 4884:torsion 4079:)) and 3348:compact 2952:be the 2152:lattice 2131:in the 2121:torsion 2119:modulo 2094:Kodaira 1519:-form: 1194:to its 372:Riemann 134:History 6165:  6155:  6114:  6104:  6084:  6074:  6043:  6033:  6010:  6000:  5976:  5966:  5841:  5409:. The 5314:, and 4671:. The 4425:-lemma 4380:, the 3826:. By 3775:. (If 3174:type ( 3128:. The 3099:smooth 2377:Atiyah 2105:kernel 2056:. The 1966:closed 1962:closed 1284:. The 823:where 616:. Let 158:. By 53:using 5945:(PDF) 5839:JSTOR 5802:(PDF) 5791:(PDF) 5772:Notes 5507:with 5174:over 4202:genus 4198:curve 3781:Serre 3749:sheaf 3313:with 3185:with 3116:. By 3097:be a 2974:Id = 1960:on a 834:on Ω( 620:be a 46:of a 6153:ISBN 6102:ISBN 6072:ISBN 6031:ISBN 5998:ISBN 5964:ISBN 5795:EPFL 5101:The 4452:Let 4326:The 4089:(by 4023:The 3785:GAGA 3324:and 3093:Let 2967:and 2901:Let 2812:Δ = 2381:Bott 2379:and 1564:< 634:real 529:and 381:and 286:sing 100:and 69:, a 6143:hdl 6135:doi 6064:doi 5831:doi 5389:of 5078:of 4830:.) 4810:on 4512:of 4492:in 4371:= 1 4353:to 4330:of 4200:of 4093:). 4071:of 3783:'s 3489:of 3358:of 3132:on 2978:+ Δ 2446:be 2228:= 0 2136:GL( 2127:of 1973:= 0 1947:= 0 1822:is 1680:of 990:on 923:ker 875:of 869:= 0 862:= 0 647:on 92:on 61:on 30:In 6190:: 6163:MR 6161:, 6151:, 6141:, 6133:, 6112:MR 6110:, 6100:, 6096:, 6082:MR 6080:, 6070:, 6062:, 6058:, 6041:MR 6039:, 6029:, 6025:, 6008:MR 6006:, 5996:, 5992:, 5974:MR 5972:. 5954:; 5858:, 5837:. 5827:28 5825:. 5610:. 5445:20 5371:20 5300:22 4427:. 4373:. 4358:× 4343:+1 4288:20 4084:= 4054:= 4020:. 3838:. 3493:. 3479:, 3340:, 3194:= 3190:+ 3178:, 3148:. 3144:a 3134:CP 3126:CP 3114:CP 3009:GL 3007:= 3000:, 2998:GL 2996:= 2994:LG 2986:+ 2982:= 2816:+ 2814:LL 2456:dV 2296:im 2271:im 2148:)) 2144:, 1971:dα 1444::= 1227:: 941:im 853:∘ 851:+1 321:dR 216:dR 112:. 81:. 34:, 6145:: 6137:: 6066:: 5980:. 5845:. 5833:: 5713:X 5693:X 5665:X 5645:X 5558:Z 5537:) 5534:X 5531:( 5526:1 5523:, 5520:1 5516:H 5495:) 5491:Z 5487:, 5484:X 5481:( 5476:2 5472:H 5451:a 5425:a 5397:X 5366:C 5344:) 5341:X 5338:( 5333:1 5330:, 5327:1 5323:H 5295:Z 5273:) 5269:Z 5265:, 5262:X 5259:( 5254:2 5250:H 5229:X 5186:X 5162:X 5142:X 5119:1 5116:= 5113:p 5086:X 5062:X 5040:p 5037:, 5034:p 5030:h 5003:/ 4999:) 4995:Z 4991:, 4988:X 4985:( 4980:p 4977:2 4973:H 4949:) 4945:C 4941:, 4938:X 4935:( 4930:p 4927:2 4923:H 4916:) 4913:X 4910:( 4905:p 4902:, 4899:p 4895:H 4888:) 4879:/ 4875:) 4871:Z 4867:, 4864:X 4861:( 4856:p 4853:2 4849:H 4845:( 4818:X 4794:X 4773:Z 4752:) 4749:X 4746:( 4741:p 4738:, 4735:p 4731:H 4710:) 4706:Z 4702:, 4699:X 4696:( 4691:p 4688:2 4684:H 4659:) 4656:X 4653:( 4648:p 4645:, 4642:p 4638:H 4617:) 4613:C 4609:, 4606:X 4603:( 4598:p 4595:2 4591:H 4570:) 4566:Z 4562:, 4559:X 4556:( 4551:p 4548:2 4544:H 4523:p 4500:X 4480:Y 4460:X 4369:1 4366:b 4360:S 4356:S 4341:a 4339:2 4336:b 4332:X 4316:1 4305:0 4300:0 4293:1 4283:1 4276:0 4271:0 4260:1 4238:1 4230:g 4223:g 4215:1 4205:g 4185:h 4172:h 4165:h 4156:h 4149:h 4142:h 4133:h 4126:h 4113:h 4086:h 4082:h 4077:X 4075:( 4073:H 4065:X 4063:( 4061:H 4056:h 4052:h 4044:X 4040:X 4038:( 4036:H 4032:X 4030:( 4028:h 4008:) 4005:X 4002:( 3997:k 3991:n 3988:, 3985:k 3979:n 3975:H 3954:) 3951:X 3948:( 3943:n 3940:, 3937:n 3933:H 3929:= 3926:) 3922:C 3918:, 3915:X 3912:( 3907:n 3904:2 3900:H 3879:) 3876:k 3873:, 3870:k 3867:( 3861:) 3858:q 3855:, 3852:p 3849:( 3836:X 3832:Z 3804:Z 3793:X 3789:p 3777:X 3773:X 3769:p 3765:X 3763:( 3761:H 3757:X 3753:p 3732:, 3729:) 3724:p 3716:, 3713:X 3710:( 3705:q 3701:H 3694:) 3691:X 3688:( 3683:q 3680:, 3677:p 3673:H 3659:X 3651:X 3649:( 3647:H 3630:. 3627:) 3624:X 3621:( 3612:q 3608:+ 3605:q 3602:, 3595:p 3591:+ 3588:p 3584:H 3577:) 3574:X 3571:( 3562:q 3558:, 3551:p 3546:H 3539:) 3536:X 3533:( 3528:q 3525:, 3522:p 3518:H 3491:X 3483:) 3481:C 3477:X 3475:( 3473:H 3468:X 3450:. 3447:) 3444:X 3441:( 3436:q 3433:, 3430:p 3426:H 3420:r 3417:= 3414:q 3411:+ 3408:p 3400:= 3397:) 3393:C 3389:, 3386:X 3383:( 3378:r 3374:H 3360:X 3352:X 3344:) 3342:q 3338:p 3336:( 3329:s 3326:w 3322:s 3319:z 3315:f 3291:q 3287:w 3281:d 3262:1 3258:w 3252:d 3244:p 3240:z 3236:d 3222:1 3218:z 3214:d 3210:f 3196:r 3192:q 3188:p 3182:) 3180:q 3176:p 3168:X 3164:r 3161:C 3157:r 3153:X 3142:X 3138:X 3103:X 3095:X 3063:) 3058:j 3054:E 3050:( 3045:H 3037:) 3032:j 3028:E 3024:( 3021:H 3005:G 3002:L 2990:Δ 2988:G 2984:H 2980:G 2976:H 2969:G 2965:H 2950:G 2934:H 2918:E 2912:: 2909:H 2886:. 2883:} 2880:0 2877:= 2874:e 2857:E 2848:e 2845:{ 2842:= 2837:H 2821:L 2818:L 2808:L 2804:L 2775:E 2758:E 2752:: 2747:i 2743:L 2737:i 2729:= 2722:L 2715:) 2710:i 2706:E 2702:( 2694:i 2686:= 2671:E 2638:0 2632:) 2627:N 2623:E 2619:( 2604:) 2599:1 2595:E 2591:( 2582:) 2577:0 2573:E 2569:( 2560:0 2547:C 2526:) 2521:1 2518:+ 2515:i 2511:E 2507:( 2498:) 2493:i 2489:E 2485:( 2479:: 2474:i 2470:L 2452:M 2432:N 2428:E 2424:, 2418:, 2413:1 2409:E 2405:, 2400:0 2396:E 2349:. 2346:) 2343:M 2340:( 2335:k 2324:H 2313:1 2310:+ 2307:k 2288:1 2282:k 2278:d 2265:) 2262:M 2259:( 2254:k 2232:L 2226:γ 2224:Δ 2220:γ 2203:, 2197:+ 2188:+ 2182:d 2179:= 2163:ω 2146:Z 2142:M 2140:( 2138:H 2129:M 2117:M 2109:M 2086:L 2082:M 2044:) 2040:R 2036:, 2033:M 2030:( 2025:k 2021:H 2014:) 2011:M 2008:( 2003:k 1992:H 1986:: 1958:α 1945:F 1943:Δ 1939:F 1914:. 1911:} 1908:0 1905:= 1893:) 1890:M 1887:( 1882:k 1868:{ 1865:= 1862:) 1859:M 1856:( 1851:k 1840:H 1820:M 1816:R 1799:. 1796:d 1790:+ 1784:d 1781:= 1748:. 1745:) 1742:M 1739:( 1734:k 1723:) 1720:M 1717:( 1712:1 1709:+ 1706:k 1698:: 1682:d 1661:. 1658:) 1655:M 1652:( 1647:2 1643:L 1635:R 1628:M 1625:: 1620:p 1612:) 1609:p 1606:( 1587:M 1570:, 1559:2 1545:= 1536:, 1517:k 1500:. 1492:p 1484:) 1481:p 1478:( 1472:, 1469:) 1466:p 1463:( 1452:M 1435:, 1423:) 1417:, 1411:( 1388:) 1385:M 1382:( 1377:k 1363:, 1350:g 1326:M 1322:k 1308:) 1305:M 1302:( 1297:k 1272:) 1269:) 1266:M 1263:( 1253:p 1249:T 1245:( 1240:k 1210:h 1207:t 1203:k 1182:) 1179:M 1176:( 1166:p 1162:T 1151:g 1133:) 1130:) 1127:M 1124:( 1114:p 1110:T 1106:( 1101:k 1069:. 1065:) 1061:) 1058:M 1055:( 1046:T 1040:k 1031:( 1024:= 1021:) 1018:M 1015:( 1010:k 992:M 988:g 966:. 958:1 952:k 948:d 934:k 930:d 914:) 910:R 906:, 903:M 900:( 895:k 891:H 877:M 867:d 859:k 855:d 849:k 845:d 836:M 827:k 825:d 808:, 805:0 798:n 794:d 785:) 782:M 779:( 774:n 762:1 756:n 752:d 736:1 732:d 723:) 720:M 717:( 712:1 700:0 696:d 687:) 684:M 681:( 676:0 665:0 649:M 645:k 630:M 626:k 618:M 590:— 560:ω 476:1 461:ω 425:1 410:ω 398:C 390:C 386:2 383:ω 379:1 376:ω 348:. 345:) 341:R 337:; 334:M 331:( 326:k 317:H 310:) 306:R 302:; 299:M 296:( 291:k 282:H 251:. 247:R 240:) 236:R 232:; 229:M 226:( 221:k 212:H 205:) 201:R 197:; 194:M 191:( 186:k 182:H 168:M 126:p 63:M 51:M 20:)

Index

Harmonic form
mathematics
W. V. D. Hodge
cohomology groups
smooth manifold
partial differential equations
Riemannian metric
canonical representative
differential form
Laplacian
algebraic geometry
Georges de Rham
de Rham cohomology
Riemannian manifolds
Kähler manifolds
projective varieties
algebraic cycles
complex numbers
number theory
p-adic Hodge theory
algebraic topology
cohomology
Élie Cartan
de Rham's theorem
Stokes' theorem
singular
perfect pairing
Solomon Lefschetz
Riemann
wedge product

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