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Rational homotopy theory

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A central result of the theory is that the rational homotopy category can be described in a purely algebraic way; in fact, in two different algebraic ways. First, Quillen showed that the rational homotopy category is equivalent to the homotopy category of connected
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The construction of Sullivan minimal models for simply connected spaces extends to nilpotent spaces. For more general fundamental groups, things get more complicated; for example, the rational homotopy groups of a finite CW complex (such as the wedge
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of simply connected spaces with respect to rational homotopy equivalences. The goal of rational homotopy theory is to understand this category (i.e. to determine the information that can be recovered from rational homotopy equivalences).
4986: 1909: 997: 667: 1306: 3051:: it is also necessary that the isomorphism of cohomology be induced by a homomorphism of differential graded algebras. There are examples of non-isomorphic minimal Sullivan models with isomorphic cohomology algebras.) 869: 3620:
need not be formal: the simplest example is the Kodaira–Thurston manifold (the product of the Heisenberg manifold with a circle). There are also examples of non-formal, simply connected symplectic closed manifolds.
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are two very different types of basic spaces from which all spaces can be built. In rational homotopy theory, these two types of spaces become much closer. In particular, Serre's calculation implies that
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is formal, then all (higher order) Massey products must vanish. The converse is not true: formality means, roughly speaking, the "uniform" vanishing of all Massey products. The complement of the
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For spaces whose rational homology in each degree has finite dimension, Sullivan classified all rational homotopy types in terms of simpler algebraic objects, Sullivan algebras. By definition, a
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cannot be a model for its cohomology algebra. The corresponding topological spaces are two spaces with isomorphic rational cohomology rings but different rational homotopy types. Notice that
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is the homotopy Lie algebra.) Second, Quillen showed that the rational homotopy category is equivalent to the homotopy category of 1-connected differential graded cocommutative
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Rational homotopy theory revealed an unexpected dichotomy among finite CW complexes: either the rational homotopy groups are zero in sufficiently high degrees, or they grow
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This suggests the possibility of describing the whole rational homotopy category in a practically computable way. Rational homotopy theory has realized much of that goal.
207: 5179: 3990: 3197: 4219: 2364:. More generally, there are versions of these constructions for differential graded algebras. This duality between commutative algebras and Lie algebras is a version of 3682: 3236: 3151: 3100: 5281: 5246: 5077: 4481: 3880: 1577: 5015: 3784: 3369: 3269: 2638: 2245: 4884: 4111: 2352:
One may ask how to pass between the two algebraic descriptions of the rational homotopy category. In short, a Lie algebra determines a graded-commutative algebra by
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of a fiber sequence of simply-connected spaces with rationally elliptic fiber of non-zero Euler characteristic vanishes at the second page.
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has a minimal Sullivan model which is unique up to isomorphism. (Warning: a minimal Sullivan algebra with the same cohomology algebra as
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should be rationally elliptic. Very little is known about the conjecture, although it holds for all known examples of such manifolds.
797:{\displaystyle H_{i}(X_{\mathbb {Q} },{\mathbb {Z} })\cong H_{i}(X,{\mathbb {Z} })\otimes {\mathbb {Q} }\cong H_{i}(X,{\mathbb {Q} })} 5781: 5723: 5682: 5581: 5532: 3616:
of real 3×3 upper triangular matrices with 1's on the diagonal by its subgroup of matrices with integral coefficients. Closed
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can be identified with (isomorphism classes of) certain algebraic objects called Sullivan minimal models, which are commutative
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with rational coefficients. An element of this algebra consists of (roughly) a polynomial form on each singular simplex of
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Conversely, one can reconstruct the rational homotopy Lie algebra from the homology of the loop space as the subspace of
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One obtains equivalent definitions using homology rather than homotopy groups. Namely, a simply connected CW complex
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A geometric application was the theorem of Sullivan and Micheline Vigué-Poirrier (1976): every simply connected
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Two spaces have the same rational homotopy type if and only if their minimal Sullivan algebras are isomorphic.
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is the rational cohomology ring.) These equivalences were among the first applications of Quillen's theory of
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model). Thus the rational homotopy type of a formal space is completely determined by its cohomology ring.
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Sullivan, Dennis; Vigué-Poirrier, Micheline (1976), "The homology theory of the closed geodesic problem",
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whose rational cohomology ring is not generated by one element has infinitely many geometrically distinct
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has a model with vanishing differential. This is equivalent to requiring that the cohomology algebra of
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The Whitehead product on rational homotopy is the dual of the "quadratic part" of the differential
2943: 2903: 2405: 2248: 96: 4833: 4759: 4282: 2383: 2330: 2195: 2057: 1719:, this just amounts to a shift of the grading by 1.) For example, Serre's theorem above says that 1633: 1529: 190: 5886: 5759: 5139: 4705: 3959: 3415: 3179: 1549: 1236: 4182: 3578: 3652: 3202: 3117: 3066: 2184:. (By contrast, there are many restrictions, not completely understood, on the integral or mod 5836:
Pavlov, Aleksandr V. (2002), "Estimates for the Betti numbers of rationally elliptic spaces",
5815: 5777: 5719: 5678: 5666: 5645: 5615: 5577: 5263: 5228: 5046: 5021: 4981:{\displaystyle \sum _{i=1}^{n}\dim _{\mathbb {Q} }\pi _{i}(X)\otimes {\mathbb {Q} }\geq C^{n}} 4450: 3849: 3407: 2044: 1904:{\displaystyle H_{*}(\Omega X,{\mathbb {Q} })\cong U(\pi _{*}(\Omega X)\otimes \mathbb {Q} ).} 1559: 1553: 1285: 860: 841: 242: 214: 169: 51: 47: 4994: 3760: 3341: 3241: 2605: 2217: 345:
that induces an isomorphism on homotopy groups tensored with the rational numbers. The space
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Another way to think of the homotopy Lie algebra is that the homology of the loop space of
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with all rational homology groups of finite dimension, there is a minimal Sullivan model
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There are many other restrictions on the rational cohomology ring of an elliptic space.
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are elliptic. On the other hand, "most" finite complexes are hyperbolic. For example:
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The rational cohomology of the space is the cohomology of its Sullivan minimal model.
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is nonnegative. If the Euler characteristic is positive, then all odd Betti numbers
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FĂ©lix, Yves; Halperin, Stephen; Thomas, Jean-Claude (1993), "Elliptic spaces II",
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of Eilenberg–MacLane spaces. The hypothesis on the cohomology ring applies to any
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predicts that every simply connected closed Riemannian manifold with nonnegative
662:{\displaystyle \pi _{i}(X_{\mathbb {Q} })\cong \pi _{i}(X)\otimes {\mathbb {Q} }} 17: 3593: 1774: 177: 31: 5804:
More Concise Algebraic Topology. Localization, Completion, and Model Categories
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is a rational homotopy equivalence if and only if it induces an isomorphism on
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is rationally elliptic if and only if the rational homology of the loop space
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is an elliptic space whose top nonzero rational cohomology group is in degree
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In particular, the second description implies that for any graded-commutative
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The rational cohomology ring of an elliptic space satisfies Poincaré duality.
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of some dimension. The simplest example of a non-formal nilmanifold is the
3582: 3558:(viewed as a differential algebra with trivial differential) is a model for 2036: 245:
of topological spaces, the subcategory of rational spaces. By definition, a
4778:-vector space (for example, a finite CW complex has this property). Define 3165:
is simply connected, such a model determines the rational homotopy type of
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is a non-formal space: it supports a nontrivial triple Massey product.
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These results for simply connected spaces extend with little change to
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satisfying the following "nilpotence condition" on its differential
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FĂ©lix, Halperin & Thomas (2001), Corollary to Proposition 16.7.
2192:.) In the same spirit, Sullivan showed that any graded-commutative 3605: 2402:, whose underlying algebra is the free commutative graded algebra 1293: 5611: 2380:
is a commutative differential graded algebra over the rationals
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that induces an isomorphism on rational homology. Thus, one has
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commutative algebra determines a graded Lie algebra by reduced
1526:. The rational cohomology is a graded-commutative algebra over 257:
over the rational numbers. For any simply connected CW complex
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are unbounded. The theorem then follows from a 1969 result of
3063:, Sullivan defined a commutative differential graded algebra 2688:, "commutative" is used to mean graded-commutative; that is, 5598:
FĂ©lix, Yves; Halperin, Stephen; Thomas, Jean-Claude (2015),
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FĂ©lix, Yves; Halperin, Stephen; Thomas, Jean-Claude (2001),
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are the duals of the rational homotopy groups of the space
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is a central open problem in homotopy theory. However, the
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One basic result is that the rational homotopy category is
106:. The proof used rational homotopy theory to show that the 3406:
is a smooth manifold, the differential algebra of smooth
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is the union of an increasing series of graded subspaces,
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cohomology rings of topological spaces, for prime numbers
1766:{\displaystyle \pi _{*}(\Omega S^{n})\otimes \mathbb {Q} } 5299:– analogue of rational homotopy theory in p-adic settings 3422:; more precisely it is the tensor product of a model for 2039:. (The associated coalgebra is the rational homology of 5490:
FĂ©lix, Halperin & Thomas (2001), Proposition 32.10.
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FĂ©lix, Halperin & Thomas (2001), Proposition 12.10.
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FĂ©lix, Halperin & Thomas (2001), Theorem 21.5(iii).
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of finite dimension, there is a simply connected space
1968:{\displaystyle H_{*}(\Omega S^{n})\otimes \mathbb {Q} } 1251:
on generators of odd degree). Then the rationalization
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is a rational space if and only if its homology groups
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FĂ©lix, Halperin & Thomas (2001), Proposition 38.3.
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is rationally hyperbolic, then there is a real number
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is the direct sum of the positive-degree subspaces of
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be any space whose rational cohomology ring is a free
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FĂ©lix, Halperin & Thomas (2001), Theorem 21.5(i).
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For example, spheres, complex projective spaces, and
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corresponding to each possible Sullivan algebra with
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and acts nilpotently on the higher homotopy groups).
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This is called the Sullivan 2540:{\displaystyle V(0)\subseteq V(1)\subseteq \cdots } 5463:FĂ©lix, Halperin & Thomas (2001), Theorem 33.2. 5275: 5240: 5173: 5113: 5071: 5009: 4980: 4878: 4844: 4822: 4770: 4748: 4687: 4631: 4595: 4547: 4507: 4475: 4439: 4410: 4358: 4310: 4271: 4213: 4171: 4142: 4105: 4079: 4033: 3984: 3948: 3903: 3874: 3838: 3809: 3778: 3738: 3709: 3676: 3538: 3491: 3390: 3363: 3290: 3263: 3230: 3191: 3145: 3094: 3031: 2996: 2961: 2921: 2892: 2856: 2802: 2771: 2737: 2676: 2632: 2594: 2565: 2539: 2478: 2423: 2394: 2341: 2319: 2281: 2239: 2206: 2168: 2138: 2068: 2027: 1967: 1903: 1795: 1765: 1711: 1644: 1622: 1571: 1540: 1518: 1474: 1414: 1272: 1223: 1177: 1119: 980: 825: 796: 661: 581: 546: 511: 491: 465: 421: 390: 366: 337: 298: 269: 221:(of simply connected spaces) is defined to be the 201: 157: 5508:FĂ©lix, Oprea & TanrĂ© (2008), Conjecture 6.43. 5364:FĂ©lix, Halperin & Thomas (2001), Theorem 9.3. 5355:FĂ©lix, Halperin & Thomas (2001), Theorem 9.7. 5346:FĂ©lix, Halperin & Thomas (2001), Theorem 8.6. 5105: 5092: 3786:, its minimal Sullivan model has two generators 3055:The Sullivan minimal model of a topological space 2684:. In the context of differential graded algebras 5752:Interactions between Homotopy Theory and Algebra 5745:"Rational homotopy theory: a brief introduction" 5636:FĂ©lix, Yves; Oprea, John; TanrĂ©, Daniel (2008), 5499:FĂ©lix, Halperin & Thomas (2001), section 32. 4113:, its minimal Sullivan model has two generators 2251:is the cohomology ring of some simply connected 2180:whose rational cohomology ring is isomorphic to 1434:in the rational homotopy category: the rational 5675:Rational Homotopy Theory and Differential Forms 5517:FĂ©lix, Halperin & Thomas (1993), section 3. 4823:{\displaystyle \pi _{*}(X)\otimes \mathbb {Q} } 3684:, its minimal Sullivan model has one generator 3004:which induces an isomorphism on cohomology. If 1519:{\displaystyle \pi _{*}(X)\otimes \mathbb {Q} } 5710:, Amsterdam: North-Holland, pp. 757–796, 5454:FĂ©lix, Oprea & TanrĂ© (2008), Theorem 8.29. 5436:FĂ©lix, Oprea & TanrĂ© (2008), Theorem 4.43. 5337:FĂ©lix, Oprea & TanrĂ© (2008), Theorem 5.13. 5181:are zero, and the rational cohomology ring of 2936:for a commutative differential graded algebra 2028:{\displaystyle \ker(d)/\operatorname {im} (d)} 1777:graded Lie algebra on one generator of degree 5445:FĂ©lix, Oprea & TanrĂ© (2008), Remark 3.21. 3499:) can be infinite-dimensional vector spaces. 8: 5248:grows at most polynomially. More generally, 4682: 4646: 4389:of degrees 2, 3, 3 and 4 with differentials 3628:. Indeed, if a differential graded algebra 3581:. Formality is preserved under products and 3426:with the reals and therefore determines the 859:homotopy groups of spheres were computed by 5754:, Contemporary Mathematics, vol. 436, 3585:. For manifolds, formality is preserved by 3569:Examples of formal spaces include spheres, 3451:-completed homotopy theory, for all primes 2479:{\displaystyle V=\bigoplus _{n>0}V^{n},} 4041:, where the arrow indicates the action of 3507:A commutative differential graded algebra 1430:There are two basic invariants of a space 5983: 5763: 5265: 5230: 5147: 5141: 5104: 5091: 5089: 5087: 5054: 5048: 4996: 4972: 4960: 4959: 4958: 4940: 4927: 4926: 4925: 4915: 4904: 4898: 4865: 4838: 4837: 4835: 4816: 4815: 4797: 4791: 4764: 4763: 4761: 4739: 4738: 4723: 4717: 4644: 4612: 4576: 4528: 4488: 4467: 4452: 4423: 4394: 4338: 4323: 4296: 4284: 4263: 4244: 4226: 4199: 4184: 4155: 4126: 4092: 4071: 4067: 4064: 4063: 4060: 4019: 4003: 3997: 3976: 3961: 3940: 3916: 3887: 3866: 3851: 3822: 3799: 3762: 3722: 3693: 3654: 3532: 3531: 3522: 3516: 3483: 3470: 3464: 3382: 3376: 3349: 3343: 3282: 3276: 3249: 3243: 3210: 3204: 3181: 3125: 3119: 3074: 3068: 3047:need not be a minimal Sullivan model for 3025: 3024: 3015: 3009: 2974: 2945: 2905: 2875: 2869: 2848: 2832: 2826: 2794: 2788: 2763: 2757: 2720: 2696: 2645: 2607: 2578: 2552: 2502: 2467: 2451: 2439: 2407: 2388: 2387: 2385: 2335: 2334: 2332: 2311: 2306: 2294: 2270: 2264: 2225: 2219: 2200: 2199: 2197: 2160: 2154: 2121: 2108: 2097: 2096: 2088: 2062: 2061: 2059: 2005: 1988: 1961: 1960: 1948: 1932: 1926: 1891: 1890: 1869: 1848: 1847: 1846: 1828: 1822: 1782: 1759: 1758: 1746: 1730: 1724: 1685: 1663: 1657: 1638: 1637: 1635: 1616: 1615: 1594: 1588: 1561: 1534: 1533: 1531: 1512: 1511: 1493: 1487: 1465: 1464: 1449: 1443: 1394: 1389: 1388: 1387: 1368: 1363: 1362: 1361: 1348: 1343: 1342: 1341: 1328: 1327: 1326: 1308: 1264: 1263: 1262: 1256: 1199: 1198: 1190: 1160: 1155: 1154: 1153: 1147: 1105: 1073: 1056: 1050: 1049: 1041: 1034: 1033: 1018: 1005: 999: 966: 934: 928: 927: 919: 912: 911: 890: 877: 871: 812: 786: 785: 784: 769: 757: 756: 755: 744: 743: 742: 727: 712: 711: 710: 701: 700: 699: 686: 680: 654: 653: 652: 634: 618: 617: 616: 603: 597: 573: 572: 571: 559: 538: 537: 536: 524: 504: 478: 456: 455: 440: 434: 414: 383: 358: 357: 356: 350: 329: 328: 327: 315: 290: 289: 288: 282: 262: 195: 194: 192: 138: 27:Mathematical theory of topological spaces 5910:"Infinitesimal computations in topology" 1426:Cohomology ring and homotopy Lie algebra 554:(up to homotopy equivalence) with a map 63: 5313: 4272:{\displaystyle 1,u,u^{2},\ldots ,u^{n}} 4034:{\displaystyle a^{2}b\to a^{4},\ldots } 3624:Non-formality can often be detected by 1178:{\displaystyle S_{\mathbb {Q} }^{2a-1}} 217:groups with rational coefficients. The 71: 4712:be a simply connected space such that 2255:closed manifold, except in dimension 4 1292:). For example, for the unitary group 5427:May & Ponto (2012), section 13.1. 4856:. Then FĂ©lix and Halperin showed: if 4749:{\displaystyle H_{*}(X,\mathbb {Q} )} 4359:{\displaystyle xu\to u^{n+2},\ldots } 2857:{\displaystyle \bigwedge ^{+}(V)^{2}} 1983:. (The associated graded Lie algebra 1475:{\displaystyle H^{*}(X,\mathbb {Q} )} 582:{\displaystyle X\to X_{\mathbb {Q} }} 547:{\displaystyle X\to X_{\mathbb {Q} }} 466:{\displaystyle H_{i}(X,\mathbb {Z} )} 338:{\displaystyle X\to X_{\mathbb {Q} }} 7: 5915:Publications MathĂ©matiques de l'IHÉS 5867:(1969), "Rational homotopy theory", 5325: 4559:to its cohomology algebra would map 3430:. One can go further and define the 1247:on generators of even degree and an 1224:{\displaystyle K(\mathbb {Q} ,2a-1)} 3562:(though it does not have to be the 3172:To any simply connected CW complex 473:are rational vector spaces for all 5267: 5232: 5221:A simply connected finite complex 5096: 4688:{\displaystyle \langle ,,\rangle } 3539:{\displaystyle A^{0}=\mathbb {Q} } 3334:There is a simply connected space 3032:{\displaystyle A^{0}=\mathbb {Q} } 2997:{\displaystyle \bigwedge (V)\to A} 2677:{\displaystyle \bigwedge (V(k-1))} 2320:{\displaystyle \sum \pm x_{i}^{2}} 1941: 1878: 1837: 1739: 1700: 1603: 1563: 25: 5400:Quillen (1969), Corollary II.6.2. 4080:{\displaystyle \mathbb {CP} ^{n}} 3313:The spaces of indecomposables in 2893:{\displaystyle \bigwedge ^{+}(V)} 1548:, and the homotopy groups form a 253:all of whose homotopy groups are 5971:Journal of Differential Geometry 5716:10.1016/B978-044482375-5/50028-6 1981:differential graded Lie algebras 1273:{\displaystyle X_{\mathbb {Q} }} 367:{\displaystyle X_{\mathbb {Q} }} 299:{\displaystyle X_{\mathbb {Q} }} 5114:{\displaystyle {\binom {n}{i}}} 3492:{\displaystyle S^{1}\vee S^{2}} 2813:The Sullivan algebra is called 1185:is the Eilenberg–MacLane space 89:satisfying certain conditions. 5409:Sullivan (1977), Theorem 13.2. 5168: 5162: 5066: 5060: 4952: 4946: 4809: 4803: 4743: 4729: 4700:Elliptic and hyperbolic spaces 4679: 4673: 4667: 4661: 4655: 4649: 4331: 4289: 4012: 3969: 3949:{\displaystyle 1,a,b\to a^{2}} 3933: 3757:is a sphere of even dimension 3600:is a formal nilmanifold, then 3238:, which has the property that 3225: 3219: 3140: 3134: 3089: 3083: 2988: 2985: 2979: 2956: 2950: 2916: 2910: 2887: 2881: 2845: 2838: 2738:{\displaystyle ab=(-1)^{ij}ba} 2717: 2707: 2671: 2668: 2656: 2650: 2627: 2624: 2618: 2612: 2589: 2583: 2528: 2522: 2513: 2507: 2418: 2412: 2022: 2016: 2002: 1996: 1954: 1938: 1895: 1884: 1875: 1862: 1853: 1834: 1752: 1736: 1706: 1697: 1675: 1669: 1609: 1600: 1505: 1499: 1469: 1455: 1323: 1316: 1218: 1195: 1027: 1011: 905: 883: 791: 775: 749: 733: 717: 692: 646: 640: 624: 609: 564: 529: 460: 446: 320: 158:{\displaystyle f\colon X\to Y} 149: 58:is ignored. It was founded by 1: 5838:Siberian Mathematical Journal 5756:American Mathematical Society 4852:-vector space, and otherwise 4830:is also a finite-dimensional 4221:. It has a basis of elements 3746:, and a basis of elements 1, 3649:is a sphere of odd dimension 3104:polynomial differential forms 2962:{\displaystyle \bigwedge (V)} 2922:{\displaystyle \bigwedge (V)} 2424:{\displaystyle \bigwedge (V)} 1814:of the homotopy Lie algebra: 1652:. In view of the isomorphism 1630:is a graded Lie algebra over 1482:and the homotopy Lie algebra 519:is the unique rational space 402:of a space at a given set of 174:rational homotopy equivalence 5638:Algebraic Models in Geometry 4845:{\displaystyle \mathbb {Q} } 4771:{\displaystyle \mathbb {Q} } 4311:{\displaystyle x\to u^{n+1}} 3596:are almost never formal: if 2395:{\displaystyle \mathbb {Q} } 2342:{\displaystyle \mathbb {Q} } 2207:{\displaystyle \mathbb {Q} } 2069:{\displaystyle \mathbb {Q} } 1812:universal enveloping algebra 1645:{\displaystyle \mathbb {Q} } 1541:{\displaystyle \mathbb {Q} } 277:, there is a rational space 202:{\displaystyle \mathbb {Q} } 83:differential graded algebras 5957:Encyclopedia of Mathematics 5812:University of Chicago Press 5600:Rational Homotopy Theory II 5533:L'Enseignement mathĂ©matique 5174:{\displaystyle b_{2i+1}(X)} 3985:{\displaystyle ab\to a^{3}} 3192:{\displaystyle \bigwedge V} 1556:. (More precisely, writing 77:Rational homotopy types of 42:is a simplified version of 6026: 5952:"Rational homotopy theory" 5950:Sullivan, Dennis (2001) , 5801:; Ponto, Kathleen (2012), 5214:asserts that the rational 5187:complete intersection ring 4214:{\displaystyle dx=u^{n+1}} 3911:, and a basis of elements 3592:On the other hand, closed 3059:For any topological space 853:homotopy groups of spheres 219:rational homotopy category 187:with the rational numbers 5574:10.1007/978-1-4613-0105-9 5481:Pavlov (2002), Theorem 1. 5303:Chromatic homotopy theory 5043:, then each Betti number 4639:is in the Massey product 3677:{\displaystyle 2n+1>1} 3231:{\displaystyle A_{PL}(X)} 3146:{\displaystyle A_{PL}(X)} 3095:{\displaystyle A_{PL}(X)} 2431:on a graded vector space 5562:Rational Homotopy Theory 5276:{\displaystyle \Omega X} 5241:{\displaystyle \Omega X} 5072:{\displaystyle b_{i}(X)} 4756:is a finite-dimensional 4555:. Any homomorphism from 4476:{\displaystyle dx=a^{2}} 4054:complex projective space 3875:{\displaystyle db=a^{2}} 3436:-completed homotopy type 3418:) is almost a model for 3102:, called the algebra of 2362:André–Quillen cohomology 1572:{\displaystyle \Omega X} 1288:(or more generally, any 1139:Eilenberg–MacLane spaces 40:rational homotopy theory 5850:10.1023/A:1021173418920 5642:Oxford University Press 5216:Serre spectral sequence 5121:(with equality for the 5010:{\displaystyle n\geq N} 3779:{\displaystyle 2n>0} 3364:{\displaystyle V^{1}=0} 3264:{\displaystyle V^{1}=0} 2633:{\displaystyle d(V(k))} 2240:{\displaystyle A^{1}=0} 2149:with each vector space 79:simply connected spaces 5985:10.4310/jdg/1214433729 5774:10.1090/conm/436/08409 5677:, Boston: Birkhäuser, 5277: 5242: 5175: 5115: 5073: 5011: 4982: 4920: 4880: 4879:{\displaystyle C>1} 4846: 4824: 4772: 4750: 4689: 4633: 4597: 4549: 4509: 4477: 4441: 4412: 4360: 4312: 4273: 4215: 4173: 4144: 4107: 4106:{\displaystyle n>0} 4081: 4035: 3986: 3950: 3905: 3876: 3840: 3811: 3780: 3740: 3711: 3678: 3612:, the quotient of the 3540: 3493: 3392: 3365: 3292: 3265: 3232: 3193: 3147: 3096: 3033: 2998: 2963: 2940:is a Sullivan algebra 2923: 2894: 2858: 2804: 2773: 2739: 2678: 2634: 2596: 2567: 2541: 2480: 2425: 2396: 2354:Lie algebra cohomology 2343: 2321: 2283: 2282:{\displaystyle A^{2a}} 2241: 2208: 2170: 2140: 2070: 2029: 1969: 1905: 1797: 1767: 1713: 1646: 1624: 1579:for the loop space of 1573: 1542: 1520: 1476: 1416: 1274: 1231:. More generally, let 1225: 1179: 1121: 982: 827: 826:{\displaystyle i>0} 798: 663: 583: 548: 513: 493: 492:{\displaystyle i>0} 467: 423: 392: 368: 339: 300: 271: 249:is a simply connected 203: 159: 5870:Annals of Mathematics 5667:Griffiths, Phillip A. 5278: 5243: 5211:Halperin's conjecture 5176: 5132:of an elliptic space 5116: 5074: 5012: 4983: 4900: 4881: 4854:rationally hyperbolic 4847: 4825: 4773: 4751: 4690: 4634: 4632:{\displaystyle xb-ay} 4598: 4596:{\displaystyle xb-ay} 4550: 4548:{\displaystyle xb-ay} 4510: 4508:{\displaystyle dy=ab} 4478: 4442: 4413: 4361: 4313: 4274: 4216: 4174: 4145: 4108: 4082: 4036: 3987: 3951: 3906: 3877: 3841: 3812: 3781: 3741: 3712: 3679: 3541: 3494: 3393: 3391:{\displaystyle V^{k}} 3366: 3293: 3291:{\displaystyle V^{k}} 3266: 3233: 3194: 3148: 3097: 3034: 2999: 2964: 2924: 2895: 2859: 2805: 2803:{\displaystyle A^{j}} 2774: 2772:{\displaystyle A^{i}} 2740: 2679: 2635: 2597: 2568: 2542: 2481: 2426: 2397: 2344: 2322: 2284: 2242: 2209: 2171: 2169:{\displaystyle A^{i}} 2141: 2071: 2030: 1970: 1906: 1798: 1768: 1714: 1647: 1625: 1574: 1543: 1521: 1477: 1417: 1275: 1226: 1180: 1122: 983: 828: 799: 664: 584: 549: 514: 494: 468: 424: 393: 369: 340: 301: 272: 204: 160: 5758:, pp. 175–202, 5264: 5229: 5140: 5130:Euler characteristic 5125:-dimensional torus). 5086: 5081:binomial coefficient 5047: 4995: 4897: 4864: 4834: 4790: 4760: 4716: 4643: 4611: 4575: 4527: 4487: 4451: 4440:{\displaystyle db=0} 4422: 4411:{\displaystyle da=0} 4393: 4322: 4283: 4225: 4183: 4172:{\displaystyle du=0} 4154: 4143:{\displaystyle 2n+1} 4125: 4091: 4059: 3996: 3960: 3915: 3904:{\displaystyle da=0} 3886: 3850: 3839:{\displaystyle 4n+1} 3821: 3798: 3761: 3739:{\displaystyle da=0} 3721: 3710:{\displaystyle 2n+1} 3692: 3653: 3618:symplectic manifolds 3515: 3463: 3398:of finite dimension. 3375: 3342: 3275: 3242: 3203: 3180: 3118: 3067: 3008: 2973: 2969:with a homomorphism 2944: 2904: 2868: 2825: 2787: 2756: 2695: 2644: 2606: 2595:{\displaystyle V(0)} 2577: 2551: 2501: 2438: 2406: 2384: 2331: 2293: 2263: 2218: 2196: 2153: 2087: 2058: 2043:as a coalgebra; the 1987: 1925: 1821: 1781: 1723: 1656: 1634: 1587: 1560: 1530: 1486: 1442: 1307: 1255: 1189: 1146: 1133:In homotopy theory, 998: 870: 811: 679: 596: 558: 523: 503: 477: 433: 413: 382: 349: 314: 308:homotopy equivalence 281: 261: 191: 137: 122:and Wolfgang Meyer. 34:and specifically in 5708:History of Topology 5546:10.5169/seals-60412 5254:integrally elliptic 5204:sectional curvature 4784:rationally elliptic 3610:Heisenberg manifold 3443:for a prime number 2566:{\displaystyle d=0} 2316: 1796:{\displaystyle n-1} 1408: 1373: 1353: 1174: 97:Riemannian manifold 60:Dennis Sullivan 5936:10338.dmlcz/128041 5928:10.1007/bf02684341 5273: 5238: 5171: 5111: 5069: 5022:homogeneous spaces 5007: 4978: 4876: 4842: 4820: 4768: 4746: 4685: 4629: 4593: 4571:; so it would map 4545: 4505: 4473: 4437: 4408: 4356: 4308: 4269: 4211: 4169: 4140: 4103: 4077: 4031: 3982: 3946: 3901: 3872: 3836: 3810:{\displaystyle 2n} 3807: 3776: 3736: 3707: 3674: 3536: 3489: 3428:real homotopy type 3408:differential forms 3388: 3361: 3288: 3261: 3228: 3189: 3143: 3092: 3029: 2994: 2959: 2919: 2890: 2854: 2800: 2769: 2735: 2674: 2630: 2592: 2563: 2537: 2476: 2462: 2421: 2392: 2339: 2317: 2302: 2279: 2237: 2204: 2166: 2136: 2066: 2025: 1965: 1916:primitive elements 1901: 1793: 1763: 1709: 1642: 1620: 1569: 1550:graded Lie algebra 1538: 1516: 1472: 1412: 1383: 1357: 1337: 1270: 1237:graded-commutative 1221: 1175: 1149: 1117: 1112: 978: 973: 823: 794: 659: 579: 544: 509: 489: 463: 419: 388: 364: 335: 296: 267: 199: 170:topological spaces 155: 68:Daniel Quillen 48:topological spaces 5821:978-0-226-51178-8 5651:978-0-19-920651-3 5621:978-981-4651-42-4 5297:Mandell's theorem 5103: 4567:to a multiple of 4121:of degrees 2 and 2880: 2837: 2447: 2372:Sullivan algebras 2045:dual vector space 1554:Whitehead product 1286:compact Lie group 1108: 1076: 1059: 969: 937: 861:Jean-Pierre Serre 842:fundamental group 512:{\displaystyle X} 422:{\displaystyle X} 391:{\displaystyle X} 270:{\displaystyle X} 243:homotopy category 215:singular homology 176:if it induces an 18:Rational homotopy 16:(Redirected from 6017: 5996: 5987: 5964: 5946: 5906:Sullivan, Dennis 5901: 5860: 5844:(6): 1080–1085, 5832: 5809: 5794: 5767: 5749: 5736: 5695: 5662: 5632: 5604:World Scientific 5594: 5556: 5518: 5515: 5509: 5506: 5500: 5497: 5491: 5488: 5482: 5479: 5473: 5470: 5464: 5461: 5455: 5452: 5446: 5443: 5437: 5434: 5428: 5425: 5419: 5416: 5410: 5407: 5401: 5398: 5392: 5389: 5383: 5380: 5374: 5371: 5365: 5362: 5356: 5353: 5347: 5344: 5338: 5335: 5329: 5323: 5282: 5280: 5279: 5274: 5247: 5245: 5244: 5239: 5180: 5178: 5177: 5172: 5161: 5160: 5120: 5118: 5117: 5112: 5110: 5109: 5108: 5095: 5078: 5076: 5075: 5070: 5059: 5058: 5016: 5014: 5013: 5008: 4987: 4985: 4984: 4979: 4977: 4976: 4964: 4963: 4945: 4944: 4932: 4931: 4930: 4919: 4914: 4885: 4883: 4882: 4877: 4851: 4849: 4848: 4843: 4841: 4829: 4827: 4826: 4821: 4819: 4802: 4801: 4777: 4775: 4774: 4769: 4767: 4755: 4753: 4752: 4747: 4742: 4728: 4727: 4694: 4692: 4691: 4686: 4638: 4636: 4635: 4630: 4602: 4600: 4599: 4594: 4554: 4552: 4551: 4546: 4514: 4512: 4511: 4506: 4482: 4480: 4479: 4474: 4472: 4471: 4446: 4444: 4443: 4438: 4417: 4415: 4414: 4409: 4365: 4363: 4362: 4357: 4349: 4348: 4317: 4315: 4314: 4309: 4307: 4306: 4278: 4276: 4275: 4270: 4268: 4267: 4249: 4248: 4220: 4218: 4217: 4212: 4210: 4209: 4178: 4176: 4175: 4170: 4149: 4147: 4146: 4141: 4112: 4110: 4109: 4104: 4086: 4084: 4083: 4078: 4076: 4075: 4070: 4040: 4038: 4037: 4032: 4024: 4023: 4008: 4007: 3991: 3989: 3988: 3983: 3981: 3980: 3955: 3953: 3952: 3947: 3945: 3944: 3910: 3908: 3907: 3902: 3881: 3879: 3878: 3873: 3871: 3870: 3845: 3843: 3842: 3837: 3816: 3814: 3813: 3808: 3785: 3783: 3782: 3777: 3745: 3743: 3742: 3737: 3716: 3714: 3713: 3708: 3683: 3681: 3680: 3675: 3614:Heisenberg group 3579:Kähler manifolds 3575:symmetric spaces 3545: 3543: 3542: 3537: 3535: 3527: 3526: 3498: 3496: 3495: 3490: 3488: 3487: 3475: 3474: 3397: 3395: 3394: 3389: 3387: 3386: 3370: 3368: 3367: 3362: 3354: 3353: 3297: 3295: 3294: 3289: 3287: 3286: 3270: 3268: 3267: 3262: 3254: 3253: 3237: 3235: 3234: 3229: 3218: 3217: 3198: 3196: 3195: 3190: 3152: 3150: 3149: 3144: 3133: 3132: 3101: 3099: 3098: 3093: 3082: 3081: 3038: 3036: 3035: 3030: 3028: 3020: 3019: 3003: 3001: 3000: 2995: 2968: 2966: 2965: 2960: 2928: 2926: 2925: 2920: 2899: 2897: 2896: 2891: 2879: 2871: 2863: 2861: 2860: 2855: 2853: 2852: 2836: 2828: 2821:is contained in 2817:if the image of 2809: 2807: 2806: 2801: 2799: 2798: 2778: 2776: 2775: 2770: 2768: 2767: 2744: 2742: 2741: 2736: 2728: 2727: 2683: 2681: 2680: 2675: 2640:is contained in 2639: 2637: 2636: 2631: 2601: 2599: 2598: 2593: 2572: 2570: 2569: 2564: 2546: 2544: 2543: 2538: 2485: 2483: 2482: 2477: 2472: 2471: 2461: 2430: 2428: 2427: 2422: 2401: 2399: 2398: 2393: 2391: 2378:Sullivan algebra 2348: 2346: 2345: 2340: 2338: 2326: 2324: 2323: 2318: 2315: 2310: 2288: 2286: 2285: 2280: 2278: 2277: 2249:PoincarĂ© duality 2246: 2244: 2243: 2238: 2230: 2229: 2213: 2211: 2210: 2205: 2203: 2175: 2173: 2172: 2167: 2165: 2164: 2145: 2143: 2142: 2137: 2126: 2125: 2113: 2112: 2100: 2075: 2073: 2072: 2067: 2065: 2049:model categories 2034: 2032: 2031: 2026: 2009: 1974: 1972: 1971: 1966: 1964: 1953: 1952: 1937: 1936: 1910: 1908: 1907: 1902: 1894: 1874: 1873: 1852: 1851: 1833: 1832: 1802: 1800: 1799: 1794: 1772: 1770: 1769: 1764: 1762: 1751: 1750: 1735: 1734: 1718: 1716: 1715: 1710: 1696: 1695: 1668: 1667: 1651: 1649: 1648: 1643: 1641: 1629: 1627: 1626: 1621: 1619: 1599: 1598: 1578: 1576: 1575: 1570: 1547: 1545: 1544: 1539: 1537: 1525: 1523: 1522: 1517: 1515: 1498: 1497: 1481: 1479: 1478: 1473: 1468: 1454: 1453: 1421: 1419: 1418: 1413: 1407: 1393: 1392: 1372: 1367: 1366: 1352: 1347: 1346: 1333: 1332: 1331: 1279: 1277: 1276: 1271: 1269: 1268: 1267: 1249:exterior algebra 1230: 1228: 1227: 1222: 1202: 1184: 1182: 1181: 1176: 1173: 1159: 1158: 1126: 1124: 1123: 1118: 1116: 1115: 1109: 1106: 1077: 1074: 1060: 1057: 1053: 1037: 1026: 1025: 1010: 1009: 987: 985: 984: 979: 977: 976: 970: 967: 938: 935: 931: 915: 904: 903: 882: 881: 838:nilpotent spaces 832: 830: 829: 824: 803: 801: 800: 795: 790: 789: 774: 773: 761: 760: 748: 747: 732: 731: 716: 715: 706: 705: 704: 691: 690: 668: 666: 665: 660: 658: 657: 639: 638: 623: 622: 621: 608: 607: 588: 586: 585: 580: 578: 577: 576: 553: 551: 550: 545: 543: 542: 541: 518: 516: 515: 510: 498: 496: 495: 490: 472: 470: 469: 464: 459: 445: 444: 428: 426: 425: 420: 397: 395: 394: 389: 373: 371: 370: 365: 363: 362: 361: 344: 342: 341: 336: 334: 333: 332: 305: 303: 302: 297: 295: 294: 293: 276: 274: 273: 268: 239:full subcategory 209:. Equivalently: 208: 206: 205: 200: 198: 167:simply connected 164: 162: 161: 156: 104:closed geodesics 87:rational numbers 21: 6025: 6024: 6020: 6019: 6018: 6016: 6015: 6014: 6010:Homotopy theory 6000: 5999: 5967: 5949: 5904: 5883:10.2307/1970725 5865:Quillen, Daniel 5863: 5835: 5822: 5807: 5797: 5784: 5747: 5739: 5726: 5698: 5685: 5671:Morgan, John W. 5665: 5652: 5635: 5622: 5597: 5584: 5566:Springer Nature 5559: 5529: 5526: 5521: 5516: 5512: 5507: 5503: 5498: 5494: 5489: 5485: 5480: 5476: 5471: 5467: 5462: 5458: 5453: 5449: 5444: 5440: 5435: 5431: 5426: 5422: 5417: 5413: 5408: 5404: 5399: 5395: 5390: 5386: 5381: 5377: 5372: 5368: 5363: 5359: 5354: 5350: 5345: 5341: 5336: 5332: 5324: 5315: 5311: 5293: 5262: 5261: 5227: 5226: 5143: 5138: 5137: 5090: 5084: 5083: 5079:is at most the 5050: 5045: 5044: 4993: 4992: 4968: 4936: 4921: 4895: 4894: 4886:and an integer 4862: 4861: 4832: 4831: 4793: 4788: 4787: 4758: 4757: 4719: 4714: 4713: 4702: 4641: 4640: 4609: 4608: 4573: 4572: 4525: 4524: 4485: 4484: 4463: 4449: 4448: 4420: 4419: 4391: 4390: 4373:has 4 elements 4334: 4320: 4319: 4292: 4281: 4280: 4259: 4240: 4223: 4222: 4195: 4181: 4180: 4152: 4151: 4123: 4122: 4089: 4088: 4062: 4057: 4056: 4015: 3999: 3994: 3993: 3972: 3958: 3957: 3936: 3913: 3912: 3884: 3883: 3862: 3848: 3847: 3819: 3818: 3796: 3795: 3759: 3758: 3719: 3718: 3690: 3689: 3651: 3650: 3642: 3634:Borromean rings 3626:Massey products 3518: 3513: 3512: 3505: 3479: 3466: 3461: 3460: 3416:de Rham complex 3378: 3373: 3372: 3345: 3340: 3339: 3278: 3273: 3272: 3245: 3240: 3239: 3206: 3201: 3200: 3178: 3177: 3121: 3116: 3115: 3070: 3065: 3064: 3057: 3011: 3006: 3005: 2971: 2970: 2942: 2941: 2902: 2901: 2866: 2865: 2844: 2823: 2822: 2790: 2785: 2784: 2759: 2754: 2753: 2716: 2693: 2692: 2642: 2641: 2604: 2603: 2575: 2574: 2549: 2548: 2499: 2498: 2463: 2436: 2435: 2404: 2403: 2382: 2381: 2374: 2329: 2328: 2291: 2290: 2289:is of the form 2266: 2261: 2260: 2247:that satisfies 2221: 2216: 2215: 2194: 2193: 2156: 2151: 2150: 2117: 2104: 2085: 2084: 2056: 2055: 1985: 1984: 1944: 1928: 1923: 1922: 1865: 1824: 1819: 1818: 1779: 1778: 1742: 1726: 1721: 1720: 1681: 1659: 1654: 1653: 1632: 1631: 1590: 1585: 1584: 1583:, we have that 1558: 1557: 1528: 1527: 1489: 1484: 1483: 1445: 1440: 1439: 1428: 1322: 1305: 1304: 1258: 1253: 1252: 1245:polynomial ring 1187: 1186: 1144: 1143: 1111: 1110: 1103: 1097: 1096: 1054: 1042: 1014: 1001: 996: 995: 972: 971: 964: 958: 957: 932: 920: 886: 873: 868: 867: 809: 808: 765: 723: 695: 682: 677: 676: 630: 612: 599: 594: 593: 567: 556: 555: 532: 521: 520: 501: 500: 475: 474: 436: 431: 430: 411: 410: 380: 379: 376:rationalization 352: 347: 346: 323: 312: 311: 306:, unique up to 284: 279: 278: 259: 258: 189: 188: 182:homotopy groups 135: 134: 128: 126:Rational spaces 112:free loop space 56:homotopy groups 50:, in which all 44:homotopy theory 28: 23: 22: 15: 12: 11: 5: 6023: 6021: 6013: 6012: 6002: 6001: 5998: 5997: 5978:(4): 633–644, 5965: 5947: 5902: 5877:(2): 205–295, 5861: 5833: 5820: 5795: 5782: 5737: 5724: 5704:James, Ioan M. 5696: 5683: 5663: 5650: 5633: 5620: 5595: 5582: 5557: 5540:(1–2): 25–32, 5525: 5522: 5520: 5519: 5510: 5501: 5492: 5483: 5474: 5465: 5456: 5447: 5438: 5429: 5420: 5411: 5402: 5393: 5384: 5375: 5366: 5357: 5348: 5339: 5330: 5328:, p. 757. 5312: 5310: 5307: 5306: 5305: 5300: 5292: 5289: 5272: 5269: 5237: 5234: 5191: 5190: 5170: 5167: 5164: 5159: 5156: 5153: 5150: 5146: 5126: 5107: 5102: 5099: 5094: 5068: 5065: 5062: 5057: 5053: 5033: 5006: 5003: 5000: 4989: 4988: 4975: 4971: 4967: 4962: 4957: 4954: 4951: 4948: 4943: 4939: 4935: 4929: 4924: 4918: 4913: 4910: 4907: 4903: 4875: 4872: 4869: 4840: 4818: 4814: 4811: 4808: 4805: 4800: 4796: 4766: 4745: 4741: 4737: 4734: 4731: 4726: 4722: 4708:. Namely, let 4701: 4698: 4697: 4696: 4684: 4681: 4678: 4675: 4672: 4669: 4666: 4663: 4660: 4657: 4654: 4651: 4648: 4628: 4625: 4622: 4619: 4616: 4592: 4589: 4586: 4583: 4580: 4544: 4541: 4538: 4535: 4532: 4504: 4501: 4498: 4495: 4492: 4470: 4466: 4462: 4459: 4456: 4436: 4433: 4430: 4427: 4407: 4404: 4401: 4398: 4367: 4355: 4352: 4347: 4344: 4341: 4337: 4333: 4330: 4327: 4305: 4302: 4299: 4295: 4291: 4288: 4266: 4262: 4258: 4255: 4252: 4247: 4243: 4239: 4236: 4233: 4230: 4208: 4205: 4202: 4198: 4194: 4191: 4188: 4168: 4165: 4162: 4159: 4139: 4136: 4133: 4130: 4102: 4099: 4096: 4074: 4069: 4066: 4046: 4030: 4027: 4022: 4018: 4014: 4011: 4006: 4002: 3979: 3975: 3971: 3968: 3965: 3943: 3939: 3935: 3932: 3929: 3926: 3923: 3920: 3900: 3897: 3894: 3891: 3869: 3865: 3861: 3858: 3855: 3835: 3832: 3829: 3826: 3806: 3803: 3775: 3772: 3769: 3766: 3751: 3735: 3732: 3729: 3726: 3706: 3703: 3700: 3697: 3673: 3670: 3667: 3664: 3661: 3658: 3641: 3638: 3587:connected sums 3577:, and compact 3534: 3530: 3525: 3521: 3504: 3501: 3486: 3482: 3478: 3473: 3469: 3400: 3399: 3385: 3381: 3360: 3357: 3352: 3348: 3332: 3329: 3322: 3311: 3285: 3281: 3260: 3257: 3252: 3248: 3227: 3224: 3221: 3216: 3213: 3209: 3188: 3185: 3157:for the space 3142: 3139: 3136: 3131: 3128: 3124: 3091: 3088: 3085: 3080: 3077: 3073: 3056: 3053: 3027: 3023: 3018: 3014: 2993: 2990: 2987: 2984: 2981: 2978: 2958: 2955: 2952: 2949: 2934:Sullivan model 2918: 2915: 2912: 2909: 2889: 2886: 2883: 2878: 2874: 2851: 2847: 2843: 2840: 2835: 2831: 2797: 2793: 2766: 2762: 2746: 2745: 2734: 2731: 2726: 2723: 2719: 2715: 2712: 2709: 2706: 2703: 2700: 2673: 2670: 2667: 2664: 2661: 2658: 2655: 2652: 2649: 2629: 2626: 2623: 2620: 2617: 2614: 2611: 2591: 2588: 2585: 2582: 2562: 2559: 2556: 2536: 2533: 2530: 2527: 2524: 2521: 2518: 2515: 2512: 2509: 2506: 2487: 2486: 2475: 2470: 2466: 2460: 2457: 2454: 2450: 2446: 2443: 2420: 2417: 2414: 2411: 2390: 2373: 2370: 2366:Koszul duality 2337: 2314: 2309: 2305: 2301: 2298: 2276: 2273: 2269: 2236: 2233: 2228: 2224: 2214:-algebra with 2202: 2163: 2159: 2147: 2146: 2135: 2132: 2129: 2124: 2120: 2116: 2111: 2107: 2103: 2099: 2095: 2092: 2064: 2024: 2021: 2018: 2015: 2012: 2008: 2004: 2001: 1998: 1995: 1992: 1963: 1959: 1956: 1951: 1947: 1943: 1940: 1935: 1931: 1912: 1911: 1900: 1897: 1893: 1889: 1886: 1883: 1880: 1877: 1872: 1868: 1864: 1861: 1858: 1855: 1850: 1845: 1842: 1839: 1836: 1831: 1827: 1792: 1789: 1786: 1761: 1757: 1754: 1749: 1745: 1741: 1738: 1733: 1729: 1708: 1705: 1702: 1699: 1694: 1691: 1688: 1684: 1680: 1677: 1674: 1671: 1666: 1662: 1640: 1618: 1614: 1611: 1608: 1605: 1602: 1597: 1593: 1568: 1565: 1536: 1514: 1510: 1507: 1504: 1501: 1496: 1492: 1471: 1467: 1463: 1460: 1457: 1452: 1448: 1427: 1424: 1423: 1422: 1411: 1406: 1403: 1400: 1397: 1391: 1386: 1382: 1379: 1376: 1371: 1365: 1360: 1356: 1351: 1345: 1340: 1336: 1330: 1325: 1321: 1318: 1315: 1312: 1266: 1261: 1241:tensor product 1220: 1217: 1214: 1211: 1208: 1205: 1201: 1197: 1194: 1172: 1169: 1166: 1163: 1157: 1152: 1128: 1127: 1114: 1104: 1102: 1099: 1098: 1095: 1092: 1089: 1086: 1083: 1080: 1075: or  1072: 1069: 1066: 1063: 1055: 1052: 1048: 1047: 1045: 1040: 1036: 1032: 1029: 1024: 1021: 1017: 1013: 1008: 1004: 989: 988: 975: 965: 963: 960: 959: 956: 953: 950: 947: 944: 941: 933: 930: 926: 925: 923: 918: 914: 910: 907: 902: 899: 896: 893: 889: 885: 880: 876: 851:Computing the 840:(spaces whose 822: 819: 816: 805: 804: 793: 788: 783: 780: 777: 772: 768: 764: 759: 754: 751: 746: 741: 738: 735: 730: 726: 722: 719: 714: 709: 703: 698: 694: 689: 685: 670: 669: 656: 651: 648: 645: 642: 637: 633: 629: 626: 620: 615: 611: 606: 602: 575: 570: 566: 563: 540: 535: 531: 528: 508: 488: 485: 482: 462: 458: 454: 451: 448: 443: 439: 418: 387: 374:is called the 360: 355: 331: 326: 322: 319: 292: 287: 266: 247:rational space 197: 154: 151: 148: 145: 142: 132:continuous map 127: 124: 120:Detlef Gromoll 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 6022: 6011: 6008: 6007: 6005: 5995: 5991: 5986: 5981: 5977: 5973: 5972: 5966: 5963: 5959: 5958: 5953: 5948: 5945: 5941: 5937: 5933: 5929: 5925: 5921: 5917: 5916: 5911: 5907: 5903: 5900: 5896: 5892: 5888: 5884: 5880: 5876: 5872: 5871: 5866: 5862: 5859: 5855: 5851: 5847: 5843: 5839: 5834: 5831: 5827: 5823: 5817: 5813: 5806: 5805: 5800: 5799:May, J. Peter 5796: 5793: 5789: 5785: 5783:9780821838143 5779: 5775: 5771: 5766: 5761: 5757: 5753: 5746: 5742: 5741:Hess, Kathryn 5738: 5735: 5731: 5727: 5725:0-444-82375-1 5721: 5717: 5713: 5709: 5705: 5701: 5700:Hess, Kathryn 5697: 5694: 5690: 5686: 5684:3-7643-3041-4 5680: 5676: 5672: 5668: 5664: 5661: 5657: 5653: 5647: 5643: 5639: 5634: 5631: 5627: 5623: 5617: 5613: 5609: 5605: 5602:, Singapore: 5601: 5596: 5593: 5589: 5585: 5583:0-387-95068-0 5579: 5575: 5571: 5567: 5563: 5558: 5555: 5551: 5547: 5543: 5539: 5535: 5534: 5528: 5527: 5523: 5514: 5511: 5505: 5502: 5496: 5493: 5487: 5484: 5478: 5475: 5469: 5466: 5460: 5457: 5451: 5448: 5442: 5439: 5433: 5430: 5424: 5421: 5415: 5412: 5406: 5403: 5397: 5394: 5388: 5385: 5379: 5376: 5370: 5367: 5361: 5358: 5352: 5349: 5343: 5340: 5334: 5331: 5327: 5322: 5320: 5318: 5314: 5308: 5304: 5301: 5298: 5295: 5294: 5290: 5288: 5286: 5270: 5259: 5255: 5251: 5235: 5224: 5219: 5217: 5213: 5212: 5207: 5205: 5201: 5200:'s conjecture 5199: 5194: 5188: 5184: 5165: 5157: 5154: 5151: 5148: 5144: 5135: 5131: 5127: 5124: 5100: 5097: 5082: 5063: 5055: 5051: 5042: 5038: 5034: 5031: 5030: 5029: 5027: 5023: 5018: 5004: 5001: 4998: 4973: 4969: 4965: 4955: 4949: 4941: 4937: 4933: 4922: 4916: 4911: 4908: 4905: 4901: 4893: 4892: 4891: 4889: 4873: 4870: 4867: 4859: 4855: 4812: 4806: 4798: 4794: 4785: 4781: 4735: 4732: 4724: 4720: 4711: 4707: 4706:exponentially 4699: 4676: 4670: 4664: 4658: 4652: 4626: 4623: 4620: 4617: 4614: 4606: 4590: 4587: 4584: 4581: 4578: 4570: 4566: 4562: 4558: 4542: 4539: 4536: 4533: 4530: 4522: 4518: 4502: 4499: 4496: 4493: 4490: 4468: 4464: 4460: 4457: 4454: 4434: 4431: 4428: 4425: 4405: 4402: 4399: 4396: 4388: 4384: 4380: 4376: 4372: 4369:Suppose that 4368: 4353: 4350: 4345: 4342: 4339: 4335: 4328: 4325: 4303: 4300: 4297: 4293: 4286: 4264: 4260: 4256: 4253: 4250: 4245: 4241: 4237: 4234: 4231: 4228: 4206: 4203: 4200: 4196: 4192: 4189: 4186: 4166: 4163: 4160: 4157: 4137: 4134: 4131: 4128: 4120: 4116: 4100: 4097: 4094: 4072: 4055: 4051: 4047: 4044: 4028: 4025: 4020: 4016: 4009: 4004: 4000: 3977: 3973: 3966: 3963: 3941: 3937: 3930: 3927: 3924: 3921: 3918: 3898: 3895: 3892: 3889: 3867: 3863: 3859: 3856: 3853: 3833: 3830: 3827: 3824: 3804: 3801: 3793: 3789: 3773: 3770: 3767: 3764: 3756: 3752: 3749: 3733: 3730: 3727: 3724: 3704: 3701: 3698: 3695: 3687: 3671: 3668: 3665: 3662: 3659: 3656: 3648: 3644: 3643: 3639: 3637: 3635: 3631: 3627: 3622: 3619: 3615: 3611: 3607: 3603: 3599: 3595: 3590: 3588: 3584: 3580: 3576: 3572: 3567: 3565: 3561: 3557: 3553: 3549: 3528: 3523: 3519: 3511:, again with 3510: 3503:Formal spaces 3502: 3500: 3484: 3480: 3476: 3471: 3467: 3456: 3454: 3450: 3446: 3442: 3438: 3437: 3435: 3429: 3425: 3421: 3417: 3413: 3409: 3405: 3383: 3379: 3358: 3355: 3350: 3346: 3337: 3333: 3330: 3327: 3323: 3320: 3316: 3312: 3309: 3308: 3307: 3305: 3301: 3300:minimal model 3283: 3279: 3258: 3255: 3250: 3246: 3222: 3214: 3211: 3207: 3186: 3183: 3175: 3170: 3168: 3164: 3160: 3156: 3137: 3129: 3126: 3122: 3113: 3109: 3105: 3086: 3078: 3075: 3071: 3062: 3054: 3052: 3050: 3046: 3042: 3021: 3016: 3012: 2991: 2982: 2976: 2953: 2947: 2939: 2935: 2930: 2913: 2907: 2884: 2876: 2872: 2849: 2841: 2833: 2829: 2820: 2816: 2811: 2795: 2791: 2782: 2764: 2760: 2751: 2732: 2729: 2724: 2721: 2713: 2710: 2704: 2701: 2698: 2691: 2690: 2689: 2687: 2665: 2662: 2659: 2653: 2647: 2621: 2615: 2609: 2586: 2580: 2560: 2557: 2554: 2534: 2531: 2525: 2519: 2516: 2510: 2504: 2496: 2492: 2473: 2468: 2464: 2458: 2455: 2452: 2448: 2444: 2441: 2434: 2433: 2432: 2415: 2409: 2379: 2371: 2369: 2367: 2363: 2359: 2355: 2350: 2312: 2307: 2303: 2299: 2296: 2274: 2271: 2267: 2258: 2254: 2250: 2234: 2231: 2226: 2222: 2191: 2187: 2183: 2179: 2161: 2157: 2133: 2130: 2127: 2122: 2118: 2114: 2109: 2105: 2101: 2093: 2090: 2083: 2082: 2081: 2079: 2052: 2050: 2046: 2042: 2038: 2019: 2013: 2010: 2006: 1999: 1993: 1990: 1982: 1976: 1957: 1949: 1945: 1933: 1929: 1921: 1917: 1898: 1887: 1881: 1870: 1866: 1859: 1856: 1843: 1840: 1829: 1825: 1817: 1816: 1815: 1813: 1809: 1804: 1790: 1787: 1784: 1776: 1755: 1747: 1743: 1731: 1727: 1703: 1692: 1689: 1686: 1682: 1678: 1672: 1664: 1660: 1612: 1606: 1595: 1591: 1582: 1566: 1555: 1551: 1508: 1502: 1494: 1490: 1461: 1458: 1450: 1446: 1437: 1433: 1425: 1409: 1404: 1401: 1398: 1395: 1384: 1380: 1377: 1374: 1369: 1358: 1354: 1349: 1338: 1334: 1319: 1313: 1310: 1303: 1302: 1301: 1299: 1297: 1291: 1287: 1283: 1259: 1250: 1246: 1242: 1238: 1234: 1215: 1212: 1209: 1206: 1203: 1192: 1170: 1167: 1164: 1161: 1150: 1140: 1136: 1131: 1100: 1093: 1090: 1087: 1084: 1081: 1078: 1070: 1067: 1064: 1061: 1043: 1038: 1030: 1022: 1019: 1015: 1006: 1002: 994: 993: 992: 961: 954: 951: 948: 945: 942: 939: 921: 916: 908: 900: 897: 894: 891: 887: 878: 874: 866: 865: 864: 862: 858: 854: 849: 847: 843: 839: 834: 820: 817: 814: 781: 778: 770: 766: 762: 752: 739: 736: 728: 724: 720: 707: 696: 687: 683: 675: 674: 673: 649: 643: 635: 631: 627: 613: 604: 600: 592: 591: 590: 568: 561: 533: 526: 506: 486: 483: 480: 452: 449: 441: 437: 416: 407: 405: 404:prime numbers 401: 385: 377: 353: 324: 317: 310:, with a map 309: 285: 264: 256: 255:vector spaces 252: 248: 244: 240: 236: 231: 228: 224: 220: 216: 212: 186: 183: 179: 175: 171: 168: 152: 146: 143: 140: 133: 125: 123: 121: 117: 113: 109: 108:Betti numbers 105: 101: 98: 95: 90: 88: 84: 80: 75: 73: 69: 65: 61: 57: 53: 49: 45: 41: 37: 33: 19: 5975: 5969: 5955: 5919: 5913: 5874: 5868: 5841: 5837: 5803: 5765:math/0604626 5751: 5707: 5674: 5637: 5612:10.1142/9473 5599: 5564:, New York: 5561: 5537: 5531: 5513: 5504: 5495: 5486: 5477: 5468: 5459: 5450: 5441: 5432: 5423: 5414: 5405: 5396: 5387: 5378: 5369: 5360: 5351: 5342: 5333: 5284: 5260:homology of 5257: 5253: 5249: 5222: 5220: 5209: 5208: 5196: 5195: 5192: 5182: 5133: 5122: 5040: 5036: 5024:for compact 5019: 4990: 4887: 4857: 4853: 4783: 4779: 4709: 4703: 4604: 4568: 4564: 4560: 4556: 4520: 4516: 4386: 4382: 4378: 4374: 4370: 4118: 4114: 4049: 4042: 3791: 3787: 3754: 3747: 3685: 3646: 3629: 3623: 3609: 3604:must be the 3601: 3597: 3594:nilmanifolds 3591: 3568: 3563: 3559: 3555: 3551: 3547: 3546:, is called 3508: 3506: 3457: 3452: 3448: 3444: 3440: 3433: 3431: 3427: 3423: 3419: 3411: 3403: 3401: 3371:and all the 3335: 3325: 3318: 3314: 3303: 3299: 3271:and all the 3173: 3171: 3166: 3162: 3158: 3154: 3153:is called a 3111: 3107: 3060: 3058: 3048: 3044: 3040: 2937: 2933: 2931: 2818: 2814: 2812: 2780: 2749: 2747: 2685: 2494: 2493:: the space 2490: 2488: 2377: 2375: 2351: 2256: 2189: 2185: 2181: 2177: 2148: 2080:of the form 2077: 2053: 2040: 1977: 1920:Hopf algebra 1913: 1807: 1805: 1580: 1431: 1429: 1295: 1232: 1132: 1129: 990: 856: 850: 835: 806: 671: 408: 400:localization 375: 246: 232: 223:localization 218: 210: 173: 172:is called a 129: 115: 99: 91: 76: 39: 29: 5922:: 269–331, 5256:if the mod 3794:of degrees 1239:algebra (a 178:isomorphism 32:mathematics 5640:, Oxford: 5524:References 5252:is called 5026:Lie groups 4890:such that 3688:of degree 3583:wedge sums 2037:coalgebras 1436:cohomology 1290:loop space 1107:otherwise. 251:CW complex 235:equivalent 5962:EMS Press 5326:Hess 1999 5268:Ω 5233:Ω 5002:≥ 4966:≥ 4956:⊗ 4938:π 4934:⁡ 4902:∑ 4813:⊗ 4799:∗ 4795:π 4725:∗ 4683:⟩ 4647:⟨ 4621:− 4603:to 0. So 4585:− 4563:to 0 and 4537:− 4354:… 4332:→ 4290:→ 4254:… 4029:… 4013:→ 3970:→ 3934:→ 3477:∨ 3184:⋀ 2989:→ 2977:⋀ 2948:⋀ 2908:⋀ 2873:⋀ 2830:⋀ 2711:− 2663:− 2648:⋀ 2535:⋯ 2532:⊆ 2517:⊆ 2449:⨁ 2410:⋀ 2358:augmented 2356:, and an 2300:± 2297:∑ 2131:⋯ 2128:⊕ 2115:⊕ 2102:⊕ 2076:-algebra 2014:⁡ 1994:⁡ 1958:⊗ 1942:Ω 1934:∗ 1888:⊗ 1879:Ω 1871:∗ 1867:π 1857:≅ 1838:Ω 1830:∗ 1788:− 1756:⊗ 1740:Ω 1732:∗ 1728:π 1701:Ω 1690:− 1683:π 1679:≅ 1661:π 1613:⊗ 1604:Ω 1596:∗ 1592:π 1564:Ω 1509:⊗ 1495:∗ 1491:π 1451:∗ 1402:− 1381:× 1378:⋯ 1375:× 1355:× 1335:≃ 1314:⁡ 1213:− 1168:− 1091:− 1039:≅ 1031:⊗ 1003:π 968:otherwise 952:− 917:≅ 909:⊗ 898:− 875:π 863:in 1951: 846:nilpotent 763:≅ 753:⊗ 721:≅ 650:⊗ 632:π 628:≅ 601:π 565:→ 530:→ 321:→ 150:→ 144:: 85:over the 6004:Category 5908:(1977), 5743:(2007), 5673:(1981), 5291:See also 4991:for all 3640:Examples 3571:H-spaces 2864:, where 2547:, where 1552:via the 1058:if  936:if  857:rational 807:for all 227:category 185:tensored 36:topology 5994:0455028 5944:0646078 5899:0258031 5891:1970725 5858:1946233 5830:2884233 5792:2355774 5734:1721122 5706:(ed.), 5693:0641551 5660:2403898 5630:3379890 5592:1802847 5554:1225255 4150:, with 4052:is the 3846:, with 3564:minimal 3161:. When 3039:, then 2815:minimal 1918:in the 1810:is the 1773:is the 1282:product 1135:spheres 241:of the 225:of the 110:of the 70: ( 62: ( 54:in the 52:torsion 5992:  5942:  5897:  5889:  5856:  5828:  5818:  5790:  5780:  5732:  5722:  5691:  5681:  5658:  5648:  5628:  5618:  5590:  5580:  5552:  4782:to be 4523:, and 3548:formal 2253:smooth 94:closed 66:) and 5887:JSTOR 5808:(PDF) 5760:arXiv 5748:(PDF) 5309:Notes 5185:is a 4087:with 3717:with 3606:torus 3414:(the 3402:When 3155:model 2327:over 1438:ring 1280:is a 1243:of a 237:to a 5816:ISBN 5778:ISBN 5720:ISBN 5679:ISBN 5646:ISBN 5616:ISBN 5578:ISBN 5198:Bott 5128:The 4871:> 4179:and 4117:and 4098:> 3817:and 3790:and 3771:> 3669:> 3199:for 2783:in 2779:and 2748:for 2602:and 2456:> 1775:free 1137:and 991:and 818:> 672:and 484:> 72:1969 64:1977 46:for 5980:doi 5932:hdl 5924:doi 5879:doi 5846:doi 5770:doi 5712:doi 5608:doi 5570:doi 5542:doi 5035:If 4923:dim 4786:if 4048:If 3753:If 3645:If 3550:if 3439:of 3410:on 3302:of 3106:on 2752:in 2573:on 1991:ker 1294:SU( 844:is 378:of 180:on 165:of 114:of 30:In 6006:: 5990:MR 5988:, 5976:11 5974:, 5960:, 5954:, 5940:MR 5938:, 5930:, 5920:47 5918:, 5912:, 5895:MR 5893:, 5885:, 5875:90 5873:, 5854:MR 5852:, 5842:43 5840:, 5826:MR 5824:, 5814:, 5810:, 5788:MR 5786:, 5776:, 5768:, 5750:, 5730:MR 5728:, 5718:, 5689:MR 5687:, 5669:; 5656:MR 5654:, 5644:, 5626:MR 5624:, 5614:, 5606:, 5588:MR 5586:, 5576:, 5568:, 5550:MR 5548:, 5538:39 5536:, 5316:^ 5017:. 4519:, 4483:, 4447:, 4418:, 4385:, 4381:, 4377:, 4318:, 4279:, 3992:, 3956:, 3882:, 3589:. 3573:, 3455:. 3169:. 2932:A 2929:. 2810:. 2368:. 2349:. 2051:. 2011:im 1975:. 1803:. 1311:SU 1300:, 833:. 406:. 130:A 38:, 5982:: 5934:: 5926:: 5881:: 5848:: 5772:: 5762:: 5714:: 5610:: 5572:: 5544:: 5285:p 5271:X 5258:p 5250:X 5236:X 5223:X 5189:. 5183:X 5169:) 5166:X 5163:( 5158:1 5155:+ 5152:i 5149:2 5145:b 5134:X 5123:n 5106:) 5101:i 5098:n 5093:( 5067:) 5064:X 5061:( 5056:i 5052:b 5041:n 5037:X 5005:N 4999:n 4974:n 4970:C 4961:Q 4953:) 4950:X 4947:( 4942:i 4928:Q 4917:n 4912:1 4909:= 4906:i 4888:N 4874:1 4868:C 4858:X 4839:Q 4817:Q 4810:) 4807:X 4804:( 4780:X 4765:Q 4744:) 4740:Q 4736:, 4733:X 4730:( 4721:H 4710:X 4695:. 4680:] 4677:b 4674:[ 4671:, 4668:] 4665:a 4662:[ 4659:, 4656:] 4653:a 4650:[ 4627:y 4624:a 4618:b 4615:x 4605:V 4591:y 4588:a 4582:b 4579:x 4569:b 4565:x 4561:y 4557:V 4543:y 4540:a 4534:b 4531:x 4521:b 4517:a 4503:b 4500:a 4497:= 4494:y 4491:d 4469:2 4465:a 4461:= 4458:x 4455:d 4435:0 4432:= 4429:b 4426:d 4406:0 4403:= 4400:a 4397:d 4387:y 4383:x 4379:b 4375:a 4371:V 4366:. 4351:, 4346:2 4343:+ 4340:n 4336:u 4329:u 4326:x 4304:1 4301:+ 4298:n 4294:u 4287:x 4265:n 4261:u 4257:, 4251:, 4246:2 4242:u 4238:, 4235:u 4232:, 4229:1 4207:1 4204:+ 4201:n 4197:u 4193:= 4190:x 4187:d 4167:0 4164:= 4161:u 4158:d 4138:1 4135:+ 4132:n 4129:2 4119:x 4115:u 4101:0 4095:n 4073:n 4068:P 4065:C 4050:X 4045:. 4043:d 4026:, 4021:4 4017:a 4010:b 4005:2 4001:a 3978:3 3974:a 3967:b 3964:a 3942:2 3938:a 3931:b 3928:, 3925:a 3922:, 3919:1 3899:0 3896:= 3893:a 3890:d 3868:2 3864:a 3860:= 3857:b 3854:d 3834:1 3831:+ 3828:n 3825:4 3805:n 3802:2 3792:b 3788:a 3774:0 3768:n 3765:2 3755:X 3750:. 3748:a 3734:0 3731:= 3728:a 3725:d 3705:1 3702:+ 3699:n 3696:2 3686:a 3672:1 3666:1 3663:+ 3660:n 3657:2 3647:X 3630:A 3602:M 3598:M 3560:A 3556:A 3552:A 3533:Q 3529:= 3524:0 3520:A 3509:A 3485:2 3481:S 3472:1 3468:S 3453:p 3449:p 3445:p 3441:X 3434:p 3424:X 3420:X 3412:X 3404:X 3384:k 3380:V 3359:0 3356:= 3351:1 3347:V 3336:X 3328:. 3326:d 3321:. 3319:X 3315:V 3304:X 3284:k 3280:V 3259:0 3256:= 3251:1 3247:V 3226:) 3223:X 3220:( 3215:L 3212:P 3208:A 3187:V 3174:X 3167:X 3163:X 3159:X 3141:) 3138:X 3135:( 3130:L 3127:P 3123:A 3112:X 3108:X 3090:) 3087:X 3084:( 3079:L 3076:P 3072:A 3061:X 3049:A 3045:A 3041:A 3026:Q 3022:= 3017:0 3013:A 2992:A 2986:) 2983:V 2980:( 2957:) 2954:V 2951:( 2938:A 2917:) 2914:V 2911:( 2888:) 2885:V 2882:( 2877:+ 2850:2 2846:) 2842:V 2839:( 2834:+ 2819:d 2796:j 2792:A 2781:b 2765:i 2761:A 2750:a 2733:a 2730:b 2725:j 2722:i 2718:) 2714:1 2708:( 2705:= 2702:b 2699:a 2686:A 2672:) 2669:) 2666:1 2660:k 2657:( 2654:V 2651:( 2628:) 2625:) 2622:k 2619:( 2616:V 2613:( 2610:d 2590:) 2587:0 2584:( 2581:V 2561:0 2558:= 2555:d 2529:) 2526:1 2523:( 2520:V 2514:) 2511:0 2508:( 2505:V 2495:V 2491:d 2474:, 2469:n 2465:V 2459:0 2453:n 2445:= 2442:V 2419:) 2416:V 2413:( 2389:Q 2336:Q 2313:2 2308:i 2304:x 2275:a 2272:2 2268:A 2257:a 2235:0 2232:= 2227:1 2223:A 2201:Q 2190:p 2186:p 2182:A 2178:X 2162:i 2158:A 2134:, 2123:3 2119:A 2110:2 2106:A 2098:Q 2094:= 2091:A 2078:A 2063:Q 2041:X 2023:) 2020:d 2017:( 2007:/ 2003:) 2000:d 1997:( 1962:Q 1955:) 1950:n 1946:S 1939:( 1930:H 1899:. 1896:) 1892:Q 1885:) 1882:X 1876:( 1863:( 1860:U 1854:) 1849:Q 1844:, 1841:X 1835:( 1826:H 1808:X 1791:1 1785:n 1760:Q 1753:) 1748:n 1744:S 1737:( 1707:) 1704:X 1698:( 1693:1 1687:i 1676:) 1673:X 1670:( 1665:i 1639:Q 1617:Q 1610:) 1607:X 1601:( 1581:X 1567:X 1535:Q 1513:Q 1506:) 1503:X 1500:( 1470:) 1466:Q 1462:, 1459:X 1456:( 1447:H 1432:X 1410:. 1405:1 1399:n 1396:2 1390:Q 1385:S 1370:5 1364:Q 1359:S 1350:3 1344:Q 1339:S 1329:Q 1324:) 1320:n 1317:( 1298:) 1296:n 1265:Q 1260:X 1233:X 1219:) 1216:1 1210:a 1207:2 1204:, 1200:Q 1196:( 1193:K 1171:1 1165:a 1162:2 1156:Q 1151:S 1101:0 1094:1 1088:a 1085:4 1082:= 1079:i 1071:a 1068:2 1065:= 1062:i 1051:Q 1044:{ 1035:Q 1028:) 1023:a 1020:2 1016:S 1012:( 1007:i 962:0 955:1 949:a 946:2 943:= 940:i 929:Q 922:{ 913:Q 906:) 901:1 895:a 892:2 888:S 884:( 879:i 821:0 815:i 792:) 787:Q 782:, 779:X 776:( 771:i 767:H 758:Q 750:) 745:Z 740:, 737:X 734:( 729:i 725:H 718:) 713:Z 708:, 702:Q 697:X 693:( 688:i 684:H 655:Q 647:) 644:X 641:( 636:i 625:) 619:Q 614:X 610:( 605:i 574:Q 569:X 562:X 539:Q 534:X 527:X 507:X 487:0 481:i 461:) 457:Z 453:, 450:X 447:( 442:i 438:H 417:X 386:X 359:Q 354:X 330:Q 325:X 318:X 291:Q 286:X 265:X 211:f 196:Q 153:Y 147:X 141:f 116:X 100:X 20:)

Index

Rational homotopy
mathematics
topology
homotopy theory
topological spaces
torsion
homotopy groups
Dennis Sullivan
1977
Daniel Quillen
1969
simply connected spaces
differential graded algebras
rational numbers
closed
Riemannian manifold
closed geodesics
Betti numbers
free loop space
Detlef Gromoll
continuous map
simply connected
topological spaces
isomorphism
homotopy groups
tensored
singular homology
localization
category
equivalent

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