Knowledge (XXG)

Poincaré half-plane model

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31: 3835: 539: 531: 447: 1161: 805: 2815: 1156:{\displaystyle {\begin{aligned}\operatorname {dist} (p_{1},p_{2})&=2\operatorname {arsinh} {\frac {\|p_{2}-p_{1}\|}{2{\sqrt {y_{1}y_{2}}}}}\\&=2\operatorname {artanh} {\frac {\|p_{2}-p_{1}\|}{\|p_{2}-{\tilde {p}}_{1}\|}}\\&=2\ln {\frac {\|p_{2}-p_{1}\|+\|p_{2}-{\tilde {p}}_{1}\|}{2{\sqrt {y_{1}y_{2}}}}},\end{aligned}}} 5535: 4890: 2332: 4424: 2647: 2498: 2119: 6053: 1669: 2155: 5320: 5339: 4762: 3738:-axis which passes through the given central point. Draw a line tangent to the circle which passes through the given non-central point. Draw a horizontal line through that point of tangency and find its intersection with the vertical line. 3725:
The midpoint between the intersection of the tangent with the vertical line and the given non-central point is the center of the model circle. Draw the model circle around that new center and passing through the given non-central point.
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with one point at the origin, analogous to finding arclength on the sphere by taking a stereographic projection centered on one point and measuring the Euclidean distance in the plane from the origin to the other point.
2926: 1291: 2810:{\displaystyle \operatorname {dist} (\langle x_{1},r\rangle ,\langle x_{1}\pm r\sin \phi ,r\cos \phi \rangle )={2\operatorname {artanh} }{\bigl (}{\tan {\tfrac {1}{2}}\phi }{\bigr )}=\operatorname {gd} ^{-1}\phi ,} 124: 5743: 5059: 810: 5927: 3445: 405: 763: 3741:
The midpoint between that intersection and the given non-central point is the center of the model circle. Draw the model circle around that new center and passing through the given non-central point.
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Flavors of Geometry, MSRI Publications, Volume 31, 1997, Hyperbolic Geometry, J. W. Cannon, W. J. Floyd, R. Kenyon and W. R. Parry, page 87, Figure 19. Constructing the hyperbolic center of a circle
5920: 5848: 306: 5622: 4735: 4532: 3722:-axis which passes through the given central point. Draw a horizontal line through the non-central point. Construct the tangent to the circle at its intersection with that horizontal line. 666: 607: 4022: 5186:
The geodesics for this metric tensor are circular arcs perpendicular to the real axis (half-circles whose origin is on the real axis) and straight vertical lines ending on the real axis.
5171: 5114: 4972: 4479: 4146: 3331: 1865: 1810: 3706:(half-circle) between the two given points as in the previous case. Construct a tangent to that line at the non-central point. Drop a perpendicular from the given center point to the 450:
The distance between two points in the half-plane model can be computed in terms of Euclidean distances in an isosceles trapezoid formed by the points and their reflection across the
2618: 3710:-axis. Find the intersection of these two lines to get the center of the model circle. Draw the model circle around that new center and passing through the given non-central point. 2847: 1692: 1547: 2539: 4635: 4921: 4682: 5530:{\displaystyle \gamma (t)={\begin{pmatrix}a&b\\c&d\\\end{pmatrix}}{\begin{pmatrix}e^{t/2}&0\\0&e^{-t/2}\\\end{pmatrix}}\cdot i={\frac {aie^{t}+b}{cie^{t}+d}}.} 4885:{\displaystyle {\rm {SO}}(2)=\left.\left\{{\begin{pmatrix}\cos \theta &\sin \theta \\-\sin \theta &\cos \theta \\\end{pmatrix}}\right|\theta \in \mathbb {R} \right\}.} 3964:) is contained as an index-two normal subgroup, the other coset being the set of 2×2 matrices with real entries whose determinant equals −1, modulo plus or minus the identity. 1560: 5199: 3133: 4575: 4168: 3638: 3594: 3274: 3168: 2984: 3685:
Or in the special case where the two given points lie on a vertical line, draw that vertical line through the two points and erase the part which is on or below the
3358: 3059: 4604: 6090: 2641: 2327:{\displaystyle \operatorname {dist} (\langle x,y_{1}\rangle ,\langle x,y_{2}\rangle )=\left|\ln {\frac {y_{2}}{y_{1}}}\right|=\left|\ln(y_{2})-\ln(y_{1})\right|.} 1352: 692: 229: 4419:{\displaystyle {\begin{pmatrix}a&b\\c&d\\\end{pmatrix}}\cdot z={\frac {az+b}{cz+d}}={\frac {(ac|z|^{2}+bd+(ad+bc)\Re (z))+i(ad-bc)\Im (z)}{|cz+d|^{2}}}.} 1919: 1892: 1754: 1727: 1322: 790: 3079: 2354: 2148: 5629: 3896:
which consists of the set of 2×2 matrices with real entries whose determinant equals +1. Note that many texts (including Knowledge (XXG)) often say SL(2,
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Distance between two points can alternately be computed using ratios of Euclidean distances to the ideal points at the ends of the hyperbolic line.
3666:. For example, how to construct the half-circle in the Euclidean half-plane which models a line on the hyperbolic plane through two given points. 2856: 6254: 3988:). This includes both the orientation preserving and the orientation-reversing isometries. The orientation-reversing map (the mirror map) is 3659: 3653: 1168: 6154: 2114:{\displaystyle \operatorname {dist} (p_{1},p_{2})=\left|\ln {\frac {\|p_{2}-p_{0}\|\|p_{1}-p_{3}\|}{\|p_{1}-p_{0}\|\|p_{2}-p_{3}\|}}\right|.} 56: 4985: 5329:) acts transitively by isometries of the upper half-plane, this geodesic is mapped into the other geodesics through the action of PSL(2, 3674:
Draw the line segment between the two points. Construct the perpendicular bisector of the line segment. Find its intersection with the
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for this metric tensor, i.e. curves which minimize the distance) are represented in this model by circular arcs normal to the
3678:-axis. Draw the circle around the intersection which passes through the given points. Erase the part which is on or below the 6048:{\displaystyle \operatorname {dist} (p_{1},p_{2})=2\operatorname {arsinh} {\frac {\|p_{2}-p_{1}\|}{2{\sqrt {z_{1}z_{2}}}}}.} 5853: 5781: 258: 6365: 3557:
when the circle is completely inside the halfplane and touches the boundary a horocycle centered around the ideal point
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which means that the angles measured at a point are the same in the model as they are in the actual hyperbolic plane.
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is freely available. On page 52 one can see an example of the semicircle diagrams so characteristic of the model.
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for this metric tensor, i.e., curves which minimize the distance) are represented in this model by circular arcs
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that act on the upper half-plane by fractional linear transformations and preserve the hyperbolic distance.
3847: 2548: 3224:(a curve whose normals all converge asymptotically in the same direction, its center) is modeled by either: 2822: 1695: 1674: 1664:{\textstyle \operatorname {chord} (p_{1},p_{2})=2\sinh {\tfrac {1}{2}}\operatorname {dist} (p_{1},p_{2}),} 1529: 173: 39: 2505: 6159: 4609: 3178: 2850: 543: 5315:{\displaystyle \gamma (t)={\begin{pmatrix}e^{t/2}&0\\0&e^{-t/2}\\\end{pmatrix}}\cdot i=ie^{t}.} 4898: 4659: 538: 530: 6114: 3886: 127: 3834: 446: 6144: 5066: 3730:
If the two given points lie on a vertical line and the given center is below the other given point:
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If the two given points lie on a vertical line and the given center is above the other given point:
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Creating the one or two points in the intersection of a line and a circle (if they intersect):
3207:-axis at the same point as the vertical line which models its axis, but at an acute or obtuse 1554: 161: 3008:, geodesics (the shortest path between the points contained within it) are modeled by either: 6265: 6246: 6093: 5120: 1550: 232: 195: 165: 47: 3336: 3032: 5549: 5548:) on the upper half-plane. Starting with this model, one can obtain the flow on arbitrary 4580: 4059: 3960:) is again a projective group, and again, modulo plus or minus the identity matrix. PSL(2, 2542: 177: 6069: 208: 17: 4058:). This group is important in two ways. First, it is a symmetry group of the square 2x2 3818:
Find the intersection of the given semicircle (or vertical line) with the given circle.
2623: 1327: 671: 6331: 6295: 6186:"Distance formula for points in the Poincare half plane model on a "vertical geodesic"" 6139: 6129: 6124: 4044: 3064: 1897: 1870: 1732: 1705: 1300: 768: 150: 6346:. An elementary introduction to the Poincaré half-plane model of the hyperbolic plane. 4086:) can be used to tessellate the hyperbolic plane into cells of equal (Poincaré) area. 3822:
Creating the one or two points in the intersection of two circles (if they intersect):
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Creating the point which is the intersection of two existing lines, if they intersect:
6354: 5565: 5541: 5124: 4051: 423: 252: 146: 6270: 6149: 5062: 4063: 2339: 2133: 3544:{\displaystyle {\frac {1}{2}}\ln \left({\frac {y_{e}+r_{e}}{y_{e}-r_{e}}}\right).} 3364:
when the circle is completely inside the halfplane a hyperbolic circle with center
6119: 5553: 5545: 5181: 3247: 3236: 3194: 2987: 2942: 2124: 1515:{\textstyle \operatorname {artanh} x={\frac {1}{2}}\ln \left((1+x)/(1-x)\right)} 169: 1421:{\textstyle \operatorname {arsinh} x=\ln {\bigl (}x+{\sqrt {x^{2}+1}}{\bigr )}} 6269:
v.1, p. 1. First article in a series exploiting the half-plane model. An
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Distance from the apex of a semicircle to another point on it is the inverse
6277: 5756: 3878: 3220: 2921:{\textstyle \operatorname {artanh} x={\tfrac {1}{2}}\ln {\dfrac {1+x}{1-x}}} 419: 6185: 6208: 4082:), and thus has a hyperbolic behavior embedded in it. In particular, SL(2, 3182:(a curve equidistant from a straight line, its axis) is modeled by either: 1671:
analogous to finding arclength on a sphere in terms of chord length. This
1286:{\textstyle \|p_{2}-p_{1}\|={\sqrt {(x_{2}-x_{1})^{2}+(y_{2}-y_{1})^{2}}}} 3973: 199: 3810:
Find the intersection of the two given semicircles (or vertical lines).
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of points. Thus, functions that are periodic on a square grid, such as
3922: 2946:(points at infinity) in the Poincaré half-plane model are of two kinds: 145:
Equivalently the Poincaré half-plane model is sometimes described as a
119:{\displaystyle =\{\langle x,y\rangle \mid y>0;x,y\in \mathbb {R} \}} 5738:{\displaystyle (ds)^{2}={\frac {(dx)^{2}+(dy)^{2}+(dz)^{2}}{z^{2}}}\,} 5054:{\displaystyle \mathbb {H} ={\rm {PSL}}(2,\mathbb {R} )/{\rm {SO}}(2)} 3968:
The relationship of these groups to the Poincaré model is as follows:
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are on a hyperbolic line (Euclidean half-circle) which intersects the
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in the model to achieve the effect of the basic constructions in the
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when the circle intersects the boundary non- orthogonal a hypercycle.
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of unit-length tangent vectors on the upper half-plane, called the
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Draw a circle around the intersection of the vertical line and the
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Draw a circle around the intersection of the vertical line and the
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as the half-circle which models its axis but at an acute or obtuse
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formula can be thought of as coming from Euclidean distance in the
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Parallel rays in Poincare half-plane model of hyperbolic geometry
3440:{\displaystyle \left(x_{e},{\sqrt {y_{e}^{2}-r_{e}^{2}}}\right)} 5189:
The unit-speed geodesic going up vertically, through the point
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going through the point where the tangent and the circle meet.
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Creating the circle through one point with center another point
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Some special cases can be simplified. Two points with the same
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between the two points under the hyperbolic-plane metric is:
4789: 400:{\displaystyle (ds)^{2}={\frac {(dx)^{2}+(dy)^{2}}{y^{2}}}} 27:
Upper-half plane model of hyperbolic non-Euclidean geometry
758:{\textstyle {\tilde {p}}_{1}=\langle x_{1},-y_{1}\rangle } 202:
between the half-plane model and the Poincaré disk model.
3866:), the transforms with real coefficients, and these act 414:
measures the length along a (possibly curved) line. The
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and isometrically on the upper half-plane, making it a
434:-axis) and straight vertical rays perpendicular to the 6251:
Teoria fondamentale degli spazi di curvatura constante
5856: 5784: 5574: 5399: 5363: 5223: 4801: 4185: 3029:(curves equidistant from a central point) with center 2873: 2859: 2825: 2760: 2626: 2551: 2508: 2342: 2136: 1900: 1873: 1818: 1766: 1735: 1708: 1677: 1612: 1563: 1532: 1438: 1359: 1330: 1303: 1171: 771: 700: 674: 615: 556: 6072: 5930: 5632: 5342: 5333:). Thus, the general unit-speed geodesic is given by 5202: 5132: 5075: 4988: 4933: 4901: 4765: 4690: 4662: 4612: 4583: 4540: 4487: 4439: 4179: 4154: 4107: 3994: 3607: 3563: 3459: 3376: 3339: 3293: 3256: 3141: 3094: 3067: 3035: 2966: 2891: 2650: 2364: 2158: 1929: 1553:
length in the Minkowski metric between points in the
808: 317: 261: 211: 59: 5915:{\textstyle p_{2}=\langle x_{2},y_{2},z_{2}\rangle } 5843:{\textstyle p_{1}=\langle x_{1},y_{1},z_{1}\rangle } 301:{\displaystyle \{\langle x,y\rangle \mid y>0\},} 6084: 6047: 5922:measured in this metric along such a geodesic is: 5914: 5842: 5751:measures length along a possibly curved line. The 5737: 5616: 5529: 5314: 5165: 5108: 5053: 4966: 4915: 4884: 4729: 4676: 4629: 4598: 4569: 4526: 4473: 4418: 4162: 4140: 4043:Important subgroups of the isometry group are the 4027:The group of orientation-preserving isometries of 4016: 3632: 3588: 3543: 3439: 3352: 3325: 3268: 3162: 3127: 3073: 3053: 2978: 2920: 2841: 2809: 2635: 2612: 2533: 2492: 2348: 2326: 2142: 2113: 1913: 1886: 1859: 1804: 1748: 1721: 1686: 1663: 1541: 1514: 1420: 1346: 1316: 1285: 1155: 784: 757: 686: 660: 601: 399: 300: 223: 118: 5767:-plane) and straight vertical rays normal to the 5617:{\textstyle \{\langle x,y,z\rangle \mid z>0\}} 4730:{\displaystyle g\in {\rm {PSL}}(2,\mathbb {R} )} 4527:{\displaystyle g\in {\rm {PSL}}(2,\mathbb {R} )} 3826:Find the intersection of the two given circles. 3771:Draw a line tangent to the circle going through 4974:, this means that the isotropy subgroup of any 3858:. The subgroup that maps the upper half-plane, 3753:from the Euclidean center of the circle to the 3018:straight vertical rays orthogonal to the x-axis 661:{\textstyle p_{2}=\langle x_{2},y_{2}\rangle } 602:{\textstyle p_{1}=\langle x_{1},y_{1}\rangle } 4017:{\displaystyle z\rightarrow -{\overline {z}}} 3698:If the two points are not on a vertical line: 3670:Creating the line through two existing points 2777: 2747: 1549:formula can be thought of as coming from the 1413: 1380: 430:-axis (half-circles whose centers are on the 160:The Poincaré half-plane model is named after 8: 6007: 5981: 5909: 5870: 5837: 5798: 5763:-plane (half-circles whose origin is on the 5611: 5596: 5578: 5575: 3320: 3294: 2728: 2685: 2679: 2660: 2528: 2509: 2420: 2401: 2395: 2376: 2212: 2193: 2187: 2168: 2097: 2071: 2068: 2042: 2037: 2011: 2008: 1982: 1851: 1832: 1799: 1780: 1198: 1172: 1111: 1076: 1070: 1044: 1016: 981: 976: 950: 893: 867: 752: 723: 655: 629: 596: 570: 292: 277: 265: 262: 113: 78: 66: 63: 6188:. mathematics stackexchange. August 6, 2015 6066:This model can be generalized to model an 5544:on the unit-length tangent bundle (complex 5166:{\displaystyle {\rm {SL}}(2,\mathbb {Z} ).} 5109:{\displaystyle {\rm {PSL}}(2,\mathbb {R} )} 4967:{\displaystyle {\rm {PSL}}(2,\mathbb {R} )} 4474:{\displaystyle z_{1},z_{2}\in \mathbb {H} } 4141:{\displaystyle {\rm {PSL}}(2,\mathbb {R} )} 3941:) modulo plus or minus the identity matrix. 3789:The (hyperbolic) center is the point where 3745:Given a circle find its (hyperbolic) center 3326:{\displaystyle \langle x_{e},y_{e}\rangle } 1860:{\textstyle p_{3}=\langle x_{3},0\rangle ,} 205:This model can be generalized to model an 3015:half-circles whose origin is on the x-axis 1805:{\textstyle p_{0}=\langle x_{0},0\rangle } 6209:"Tools to work with the Half-Plane model" 6071: 6031: 6021: 6015: 6001: 5988: 5978: 5957: 5944: 5929: 5903: 5890: 5877: 5861: 5855: 5831: 5818: 5805: 5789: 5783: 5734: 5726: 5715: 5693: 5671: 5655: 5646: 5631: 5573: 5540:This provides a basic description of the 5509: 5485: 5472: 5445: 5438: 5410: 5406: 5394: 5358: 5341: 5303: 5269: 5262: 5234: 5230: 5218: 5201: 5153: 5152: 5134: 5133: 5131: 5119:The upper half-plane is tessellated into 5099: 5098: 5077: 5076: 5074: 5033: 5032: 5027: 5020: 5019: 4998: 4997: 4990: 4989: 4987: 4957: 4956: 4935: 4934: 4932: 4909: 4908: 4900: 4870: 4869: 4796: 4767: 4766: 4764: 4720: 4719: 4698: 4697: 4689: 4670: 4669: 4661: 4620: 4619: 4611: 4582: 4561: 4548: 4539: 4517: 4516: 4495: 4494: 4486: 4467: 4466: 4457: 4444: 4438: 4404: 4399: 4381: 4286: 4281: 4272: 4260: 4225: 4180: 4178: 4156: 4155: 4153: 4131: 4130: 4109: 4108: 4106: 4004: 3993: 3764:be the intersection of this line and the 3615: 3606: 3571: 3562: 3525: 3512: 3500: 3487: 3480: 3460: 3458: 3424: 3419: 3406: 3401: 3395: 3386: 3375: 3344: 3338: 3314: 3301: 3292: 3255: 3140: 3093: 3066: 3034: 2965: 2890: 2872: 2858: 2830: 2824: 2789: 2776: 2775: 2759: 2752: 2746: 2745: 2737: 2692: 2667: 2649: 2625: 2601: 2588: 2575: 2565: 2550: 2516: 2507: 2471: 2465: 2452: 2443: 2440: 2408: 2383: 2363: 2341: 2307: 2282: 2248: 2238: 2232: 2206: 2181: 2157: 2135: 2091: 2078: 2062: 2049: 2031: 2018: 2002: 1989: 1979: 1956: 1943: 1928: 1905: 1899: 1878: 1872: 1839: 1823: 1817: 1787: 1771: 1765: 1740: 1734: 1713: 1707: 1676: 1649: 1636: 1611: 1590: 1577: 1562: 1531: 1487: 1451: 1437: 1412: 1411: 1397: 1391: 1379: 1378: 1358: 1335: 1329: 1308: 1302: 1275: 1265: 1252: 1236: 1226: 1213: 1204: 1192: 1179: 1170: 1135: 1125: 1119: 1105: 1094: 1093: 1083: 1064: 1051: 1041: 1010: 999: 998: 988: 970: 957: 947: 917: 907: 901: 887: 874: 864: 839: 826: 809: 807: 776: 770: 746: 730: 714: 703: 702: 699: 673: 649: 636: 620: 614: 590: 577: 561: 555: 389: 378: 356: 340: 331: 316: 260: 210: 157:coordinate mentioned above) is positive. 109: 108: 58: 6338:, pp. 100–104, Springer-Verlag, NY 6263:(1882) "Théorie des Groupes Fuchsiens", 3598:when the circle intersects the boundary 2620:and another point at a central angle of 6177: 4074:) symmetry from the grid. Second, SL(2, 2613:{\textstyle (x-x_{1})^{2}+y^{2}=r^{2},} 176:, to show that hyperbolic geometry was 6255:Annali di Matematica Pura ed Applicata 6213:Tools to work with the Half-Plane mode 3937:}, consisting of the matrices in SL(2, 3660:compass and straightedge constructions 3654:Compass and straightedge constructions 3648:Compass and straightedge constructions 3246:-axis, in this case the center is the 5552:, as described in the article on the 3239:of intersection, which is its center) 3203:a straight line which intersects the 2842:{\textstyle \operatorname {gd} ^{-1}} 1687:{\textstyle 2\operatorname {artanh} } 1542:{\textstyle 2\operatorname {arsinh} } 796:-axis into the lower half plane, the 7: 6104:dimensional Euclidean vector space. 3854:) acts on the Riemann sphere by the 3189:a circular arc which intersects the 2534:{\textstyle \langle x_{1},r\rangle } 243:dimensional Euclidean vector space. 6302:(2002), Springer-Verlag, New York. 6284:(1980), Springer-Verlag, New York. 5138: 5135: 5084: 5081: 5078: 5037: 5034: 5005: 5002: 4999: 4942: 4939: 4936: 4771: 4768: 4705: 4702: 4699: 4630:{\displaystyle z\in \mathbb {H} ,} 4577:. It is also faithful, in that if 4502: 4499: 4496: 4367: 4325: 4116: 4113: 4110: 4078:) is of course a subgroup of SL(2, 3263: 2973: 25: 4916:{\displaystyle z\in \mathbb {H} } 4677:{\displaystyle z\in \mathbb {H} } 668:are two points in the half-plane 5568:of the model on the half- space 255:of the model on the half-plane, 4100:projective special linear group 3920:projective special linear group 3877:There are four closely related 3287:A Euclidean circle with center 6145:Models of the hyperbolic plane 5963: 5937: 5712: 5702: 5690: 5680: 5668: 5658: 5643: 5633: 5352: 5346: 5212: 5206: 5157: 5143: 5103: 5089: 5048: 5042: 5024: 5010: 4961: 4947: 4782: 4776: 4724: 4710: 4521: 4507: 4400: 4382: 4376: 4370: 4364: 4346: 4337: 4334: 4328: 4322: 4304: 4282: 4273: 4263: 4135: 4121: 3998: 3915:) is a subgroup of this group. 3900:) when they really mean PSL(2, 3627: 3608: 3583: 3564: 3157: 3151: 3122: 3119: 3113: 3095: 3048: 3036: 2731: 2657: 2572: 2552: 2472: 2444: 2313: 2300: 2288: 2275: 2215: 2165: 1962: 1936: 1655: 1629: 1596: 1570: 1504: 1492: 1484: 1472: 1272: 1245: 1233: 1206: 1099: 1004: 845: 819: 708: 375: 365: 353: 343: 328: 318: 1: 6096:by replacing the real number 5560:The model in three dimensions 4050:One also frequently sees the 3128:{\displaystyle (x,y\cosh(r))} 235:by replacing the real number 6320:, Jones and Bartlett, 1993, 6155:Schwarz–Ahlfors–Pick theorem 4570:{\displaystyle gz_{1}=z_{2}} 4163:{\displaystyle \mathbb {H} } 4070:, will thus inherit an SL(2, 4031:, sometimes denoted as Isom( 4009: 3980:, sometimes denoted as Isom( 168:who used it, along with the 6387: 6257:, ser II 2 (1868), 232–255 5179: 4035:), is isomorphic to PSL(2, 3984:), is isomorphic to PSL(2, 3651: 2930:inverse hyperbolic tangent 1760:-axis at the ideal points 1524:inverse hyperbolic tangent 5755:in the hyperbolic space ( 3633:{\displaystyle (y_{e}=0)} 3589:{\displaystyle (x_{e},0)} 3269:{\displaystyle y=\infty } 3235:-axis (but excluding the 3163:{\displaystyle y\sinh(r)} 2979:{\displaystyle y=\infty } 2936:Special points and curves 2336:Two points with the same 418:in the hyperbolic plane ( 164:, but it originated with 44:Poincaré half-plane model 18:Poincaré half-space model 6300:Compact Riemann Surfaces 6207:Bochaca, Judit Abardia. 4429:Note that the action is 3658:Here is how one can use 3231:a circle tangent to the 6318:The Poincaré Half-Plane 3862:, onto itself is PSL(2, 3848:projective linear group 3242:a line parallel to the 2960:one imaginary point at 1430:inverse hyperbolic sine 454:-axis: a "side length" 6276:Hershel M. Farkas and 6086: 6049: 5916: 5844: 5739: 5618: 5531: 5316: 5167: 5110: 5055: 4968: 4917: 4886: 4731: 4678: 4631: 4600: 4571: 4528: 4475: 4420: 4164: 4142: 4018: 3856:Möbius transformations 3843: 3634: 3590: 3545: 3441: 3354: 3327: 3270: 3193:-axis at the same two 3164: 3129: 3075: 3055: 2980: 2922: 2843: 2811: 2637: 2614: 2535: 2494: 2350: 2328: 2144: 2115: 1915: 1888: 1861: 1806: 1750: 1723: 1688: 1665: 1543: 1516: 1422: 1348: 1318: 1287: 1157: 786: 759: 688: 662: 603: 547: 535: 527: 480:. It is the logarithm 401: 302: 225: 120: 40:non-Euclidean geometry 35: 6160:Ultraparallel theorem 6087: 6050: 5917: 5845: 5740: 5619: 5532: 5317: 5168: 5111: 5061:. Alternatively, the 5056: 4969: 4918: 4887: 4732: 4679: 4632: 4601: 4572: 4529: 4476: 4421: 4165: 4143: 4019: 3837: 3778:Draw the half circle 3749:Drop a perpendicular 3635: 3591: 3546: 3442: 3355: 3353:{\displaystyle r_{e}} 3328: 3271: 3165: 3130: 3088:a circle with center 3076: 3056: 3054:{\displaystyle (x,y)} 2981: 2923: 2851:Gudermannian function 2844: 2812: 2638: 2615: 2536: 2495: 2351: 2329: 2145: 2116: 1916: 1889: 1862: 1807: 1751: 1724: 1689: 1666: 1544: 1517: 1423: 1349: 1319: 1288: 1158: 787: 765:is the reflection of 760: 689: 663: 604: 546:of the central angle. 544:Gudermannian function 541: 533: 449: 402: 303: 226: 121: 33: 6336:Numbers and Geometry 6115:Angle of parallelism 6070: 5928: 5854: 5782: 5630: 5572: 5340: 5200: 5130: 5073: 4986: 4931: 4899: 4763: 4749:. The stabilizer of 4688: 4660: 4610: 4599:{\displaystyle gz=z} 4581: 4538: 4485: 4437: 4177: 4152: 4105: 3992: 3887:special linear group 3605: 3561: 3457: 3374: 3337: 3291: 3254: 3139: 3092: 3065: 3033: 2964: 2857: 2823: 2648: 2624: 2549: 2506: 2362: 2340: 2156: 2134: 1927: 1898: 1871: 1816: 1764: 1733: 1706: 1675: 1561: 1530: 1436: 1357: 1328: 1301: 1169: 806: 769: 698: 672: 613: 554: 462:, and two "heights" 442:Distance calculation 315: 259: 209: 57: 6366:Hyperbolic geometry 6085:{\displaystyle n+1} 5778:between two points 5069:, is isomorphic to 5067:unit tangent bundle 4927:by some element of 3801:Other constructions 3429: 3411: 2990:to which all lines 2953:the points on the 2636:{\textstyle \phi .} 1696:Poincaré disk model 1347:{\textstyle p_{2},} 687:{\textstyle y>0} 224:{\displaystyle n+1} 174:Poincaré disk model 140:hyperbolic geometry 138:of two-dimensional 50:, denoted below as 6361:Conformal geometry 6100:by a vector in an 6082: 6045: 5912: 5840: 5735: 5614: 5527: 5457: 5388: 5312: 5281: 5163: 5106: 5051: 4964: 4913: 4895:Since any element 4882: 4853: 4727: 4674: 4627: 4596: 4567: 4524: 4471: 4416: 4210: 4160: 4138: 4090:Isometric symmetry 4068:elliptic functions 4014: 3844: 3838:Stellated regular 3630: 3586: 3541: 3437: 3415: 3397: 3350: 3323: 3283:Euclidean synopsis 3266: 3160: 3125: 3071: 3051: 2976: 2918: 2916: 2882: 2839: 2807: 2769: 2633: 2610: 2545:of the semicircle 2531: 2490: 2346: 2324: 2140: 2111: 1914:{\textstyle p_{2}} 1911: 1887:{\textstyle p_{1}} 1884: 1867:the distance from 1857: 1802: 1749:{\textstyle p_{2}} 1746: 1722:{\textstyle p_{1}} 1719: 1702:If the two points 1684: 1661: 1621: 1539: 1512: 1418: 1344: 1317:{\textstyle p_{1}} 1314: 1295:Euclidean distance 1283: 1153: 1151: 785:{\textstyle p_{1}} 782: 755: 684: 658: 599: 548: 536: 528: 397: 298: 239:by a vector in an 221: 182:Euclidean geometry 134:, that makes it a 126:, together with a 116: 36: 6311:(See Section 2.3) 6135:Hyperbolic motion 6040: 6037: 5732: 5522: 5121:free regular sets 4654:isotropy subgroup 4481:, there exists a 4411: 4255: 4012: 3972:The group of all 3872:homogeneous space 3840:heptagonal tiling 3640:a hyperbolic line 3532: 3468: 3430: 3074:{\displaystyle r} 2915: 2881: 2768: 2485: 2254: 2101: 1620: 1555:hyperboloid model 1459: 1409: 1281: 1144: 1141: 1102: 1020: 1007: 926: 923: 711: 395: 16:(Redirected from 6378: 6282:Riemann Surfaces 6266:Acta Mathematica 6247:Eugenio Beltrami 6233: 6230: 6224: 6223: 6221: 6219: 6204: 6198: 6197: 6195: 6193: 6182: 6094:hyperbolic space 6091: 6089: 6088: 6083: 6054: 6052: 6051: 6046: 6041: 6039: 6038: 6036: 6035: 6026: 6025: 6016: 6010: 6006: 6005: 5993: 5992: 5979: 5962: 5961: 5949: 5948: 5921: 5919: 5918: 5913: 5908: 5907: 5895: 5894: 5882: 5881: 5866: 5865: 5849: 5847: 5846: 5841: 5836: 5835: 5823: 5822: 5810: 5809: 5794: 5793: 5744: 5742: 5741: 5736: 5733: 5731: 5730: 5721: 5720: 5719: 5698: 5697: 5676: 5675: 5656: 5651: 5650: 5623: 5621: 5620: 5615: 5550:Riemann surfaces 5536: 5534: 5533: 5528: 5523: 5521: 5514: 5513: 5497: 5490: 5489: 5473: 5462: 5461: 5454: 5453: 5449: 5419: 5418: 5414: 5393: 5392: 5321: 5319: 5318: 5313: 5308: 5307: 5286: 5285: 5278: 5277: 5273: 5243: 5242: 5238: 5172: 5170: 5169: 5164: 5156: 5142: 5141: 5115: 5113: 5112: 5107: 5102: 5088: 5087: 5060: 5058: 5057: 5052: 5041: 5040: 5031: 5023: 5009: 5008: 4993: 4982:to SO(2). Thus, 4973: 4971: 4970: 4965: 4960: 4946: 4945: 4922: 4920: 4919: 4914: 4912: 4891: 4889: 4888: 4883: 4878: 4874: 4873: 4862: 4858: 4857: 4775: 4774: 4736: 4734: 4733: 4728: 4723: 4709: 4708: 4683: 4681: 4680: 4675: 4673: 4636: 4634: 4633: 4628: 4623: 4605: 4603: 4602: 4597: 4576: 4574: 4573: 4568: 4566: 4565: 4553: 4552: 4533: 4531: 4530: 4525: 4520: 4506: 4505: 4480: 4478: 4477: 4472: 4470: 4462: 4461: 4449: 4448: 4425: 4423: 4422: 4417: 4412: 4410: 4409: 4408: 4403: 4385: 4379: 4291: 4290: 4285: 4276: 4261: 4256: 4254: 4240: 4226: 4215: 4214: 4169: 4167: 4166: 4161: 4159: 4147: 4145: 4144: 4139: 4134: 4120: 4119: 4023: 4021: 4020: 4015: 4013: 4005: 3944:The group PSL(2, 3907:The group S*L(2, 3702:Draw the radial 3664:hyperbolic plane 3639: 3637: 3636: 3631: 3620: 3619: 3595: 3593: 3592: 3587: 3576: 3575: 3550: 3548: 3547: 3542: 3537: 3533: 3531: 3530: 3529: 3517: 3516: 3506: 3505: 3504: 3492: 3491: 3481: 3469: 3461: 3446: 3444: 3443: 3438: 3436: 3432: 3431: 3428: 3423: 3410: 3405: 3396: 3391: 3390: 3359: 3357: 3356: 3351: 3349: 3348: 3332: 3330: 3329: 3324: 3319: 3318: 3306: 3305: 3275: 3273: 3272: 3267: 3169: 3167: 3166: 3161: 3134: 3132: 3131: 3126: 3080: 3078: 3077: 3072: 3060: 3058: 3057: 3052: 2985: 2983: 2982: 2977: 2927: 2925: 2924: 2919: 2917: 2914: 2903: 2892: 2883: 2874: 2848: 2846: 2845: 2840: 2838: 2837: 2816: 2814: 2813: 2808: 2797: 2796: 2781: 2780: 2774: 2770: 2761: 2751: 2750: 2744: 2697: 2696: 2672: 2671: 2642: 2640: 2639: 2634: 2619: 2617: 2616: 2611: 2606: 2605: 2593: 2592: 2580: 2579: 2570: 2569: 2540: 2538: 2537: 2532: 2521: 2520: 2499: 2497: 2496: 2491: 2486: 2484: 2476: 2475: 2470: 2469: 2457: 2456: 2447: 2441: 2427: 2423: 2413: 2412: 2388: 2387: 2355: 2353: 2352: 2347: 2333: 2331: 2330: 2325: 2320: 2316: 2312: 2311: 2287: 2286: 2260: 2256: 2255: 2253: 2252: 2243: 2242: 2233: 2211: 2210: 2186: 2185: 2149: 2147: 2146: 2141: 2120: 2118: 2117: 2112: 2107: 2103: 2102: 2100: 2096: 2095: 2083: 2082: 2067: 2066: 2054: 2053: 2040: 2036: 2035: 2023: 2022: 2007: 2006: 1994: 1993: 1980: 1961: 1960: 1948: 1947: 1920: 1918: 1917: 1912: 1910: 1909: 1893: 1891: 1890: 1885: 1883: 1882: 1866: 1864: 1863: 1858: 1844: 1843: 1828: 1827: 1811: 1809: 1808: 1803: 1792: 1791: 1776: 1775: 1755: 1753: 1752: 1747: 1745: 1744: 1728: 1726: 1725: 1720: 1718: 1717: 1693: 1691: 1690: 1685: 1670: 1668: 1667: 1662: 1654: 1653: 1641: 1640: 1622: 1613: 1595: 1594: 1582: 1581: 1548: 1546: 1545: 1540: 1521: 1519: 1518: 1513: 1511: 1507: 1491: 1460: 1452: 1427: 1425: 1424: 1419: 1417: 1416: 1410: 1402: 1401: 1392: 1384: 1383: 1353: 1351: 1350: 1345: 1340: 1339: 1323: 1321: 1320: 1315: 1313: 1312: 1292: 1290: 1289: 1284: 1282: 1280: 1279: 1270: 1269: 1257: 1256: 1241: 1240: 1231: 1230: 1218: 1217: 1205: 1197: 1196: 1184: 1183: 1162: 1160: 1159: 1154: 1152: 1145: 1143: 1142: 1140: 1139: 1130: 1129: 1120: 1114: 1110: 1109: 1104: 1103: 1095: 1088: 1087: 1069: 1068: 1056: 1055: 1042: 1025: 1021: 1019: 1015: 1014: 1009: 1008: 1000: 993: 992: 979: 975: 974: 962: 961: 948: 931: 927: 925: 924: 922: 921: 912: 911: 902: 896: 892: 891: 879: 878: 865: 844: 843: 831: 830: 791: 789: 788: 783: 781: 780: 764: 762: 761: 756: 751: 750: 735: 734: 719: 718: 713: 712: 704: 693: 691: 690: 685: 667: 665: 664: 659: 654: 653: 641: 640: 625: 624: 608: 606: 605: 600: 595: 594: 582: 581: 566: 565: 526: 525: 522: 499: 479: 470: 461: 457: 453: 406: 404: 403: 398: 396: 394: 393: 384: 383: 382: 361: 360: 341: 336: 335: 307: 305: 304: 299: 233:hyperbolic space 230: 228: 227: 222: 196:Cayley transform 166:Eugenio Beltrami 125: 123: 122: 117: 112: 48:upper half-plane 21: 6386: 6385: 6381: 6380: 6379: 6377: 6376: 6375: 6351: 6350: 6349: 6237: 6236: 6231: 6227: 6217: 6215: 6206: 6205: 6201: 6191: 6189: 6184: 6183: 6179: 6169: 6164: 6110: 6068: 6067: 6064: 6027: 6017: 6011: 5997: 5984: 5980: 5953: 5940: 5926: 5925: 5899: 5886: 5873: 5857: 5852: 5851: 5827: 5814: 5801: 5785: 5780: 5779: 5722: 5711: 5689: 5667: 5657: 5642: 5628: 5627: 5570: 5569: 5562: 5505: 5498: 5481: 5474: 5456: 5455: 5434: 5432: 5426: 5425: 5420: 5402: 5395: 5387: 5386: 5381: 5375: 5374: 5369: 5359: 5338: 5337: 5299: 5280: 5279: 5258: 5256: 5250: 5249: 5244: 5226: 5219: 5198: 5197: 5184: 5178: 5128: 5127: 5071: 5070: 4984: 4983: 4929: 4928: 4897: 4896: 4852: 4851: 4840: 4825: 4824: 4813: 4797: 4792: 4791: 4788: 4761: 4760: 4686: 4685: 4658: 4657: 4608: 4607: 4579: 4578: 4557: 4544: 4536: 4535: 4483: 4482: 4453: 4440: 4435: 4434: 4398: 4380: 4280: 4262: 4241: 4227: 4209: 4208: 4203: 4197: 4196: 4191: 4181: 4175: 4174: 4150: 4149: 4103: 4102: 4092: 4045:Fuchsian groups 3990: 3989: 3832: 3830:Symmetry groups 3803: 3747: 3695: 3672: 3656: 3650: 3611: 3603: 3602: 3567: 3559: 3558: 3521: 3508: 3507: 3496: 3483: 3482: 3476: 3455: 3454: 3382: 3381: 3377: 3372: 3371: 3340: 3335: 3334: 3310: 3297: 3289: 3288: 3285: 3252: 3251: 3137: 3136: 3090: 3089: 3063: 3062: 3031: 3030: 2998:-axis converge. 2962: 2961: 2938: 2904: 2893: 2855: 2854: 2849:is the inverse 2826: 2821: 2820: 2785: 2688: 2663: 2646: 2645: 2622: 2621: 2597: 2584: 2571: 2561: 2547: 2546: 2512: 2504: 2503: 2477: 2461: 2448: 2442: 2404: 2379: 2375: 2371: 2360: 2359: 2338: 2337: 2303: 2278: 2268: 2264: 2244: 2234: 2225: 2221: 2202: 2177: 2154: 2153: 2132: 2131: 2087: 2074: 2058: 2045: 2041: 2027: 2014: 1998: 1985: 1981: 1972: 1968: 1952: 1939: 1925: 1924: 1901: 1896: 1895: 1874: 1869: 1868: 1835: 1819: 1814: 1813: 1783: 1767: 1762: 1761: 1736: 1731: 1730: 1709: 1704: 1703: 1673: 1672: 1645: 1632: 1586: 1573: 1559: 1558: 1528: 1527: 1471: 1467: 1434: 1433: 1393: 1355: 1354: 1331: 1326: 1325: 1304: 1299: 1298: 1297:between points 1271: 1261: 1248: 1232: 1222: 1209: 1188: 1175: 1167: 1166: 1150: 1149: 1131: 1121: 1115: 1092: 1079: 1060: 1047: 1043: 1023: 1022: 997: 984: 980: 966: 953: 949: 929: 928: 913: 903: 897: 883: 870: 866: 848: 835: 822: 804: 803: 772: 767: 766: 742: 726: 701: 696: 695: 670: 669: 645: 632: 616: 611: 610: 586: 573: 557: 552: 551: 523: 521: 515: 500: 497: 495: 488: 481: 478: 472: 469: 463: 459: 458:, a "diagonal" 455: 451: 444: 385: 374: 352: 342: 327: 313: 312: 257: 256: 249: 207: 206: 132:Poincaré metric 55: 54: 28: 23: 22: 15: 12: 11: 5: 6384: 6382: 6374: 6373: 6371:Henri Poincaré 6368: 6363: 6353: 6352: 6348: 6347: 6332:John Stillwell 6329: 6314: 6293: 6274: 6261:Henri Poincaré 6258: 6243: 6242: 6241: 6235: 6234: 6225: 6199: 6176: 6175: 6174: 6173: 6168: 6165: 6163: 6162: 6157: 6152: 6147: 6142: 6140:Kleinian model 6137: 6132: 6130:Fuchsian model 6127: 6125:Fuchsian group 6122: 6117: 6111: 6109: 6106: 6081: 6078: 6075: 6063: 6056: 6044: 6034: 6030: 6024: 6020: 6014: 6009: 6004: 6000: 5996: 5991: 5987: 5983: 5977: 5974: 5971: 5968: 5965: 5960: 5956: 5952: 5947: 5943: 5939: 5936: 5933: 5911: 5906: 5902: 5898: 5893: 5889: 5885: 5880: 5876: 5872: 5869: 5864: 5860: 5839: 5834: 5830: 5826: 5821: 5817: 5813: 5808: 5804: 5800: 5797: 5792: 5788: 5753:straight lines 5729: 5725: 5718: 5714: 5710: 5707: 5704: 5701: 5696: 5692: 5688: 5685: 5682: 5679: 5674: 5670: 5666: 5663: 5660: 5654: 5649: 5645: 5641: 5638: 5635: 5613: 5610: 5607: 5604: 5601: 5598: 5595: 5592: 5589: 5586: 5583: 5580: 5577: 5561: 5558: 5538: 5537: 5526: 5520: 5517: 5512: 5508: 5504: 5501: 5496: 5493: 5488: 5484: 5480: 5477: 5471: 5468: 5465: 5460: 5452: 5448: 5444: 5441: 5437: 5433: 5431: 5428: 5427: 5424: 5421: 5417: 5413: 5409: 5405: 5401: 5400: 5398: 5391: 5385: 5382: 5380: 5377: 5376: 5373: 5370: 5368: 5365: 5364: 5362: 5357: 5354: 5351: 5348: 5345: 5325:Because PSL(2, 5323: 5322: 5311: 5306: 5302: 5298: 5295: 5292: 5289: 5284: 5276: 5272: 5268: 5265: 5261: 5257: 5255: 5252: 5251: 5248: 5245: 5241: 5237: 5233: 5229: 5225: 5224: 5222: 5217: 5214: 5211: 5208: 5205: 5180:Main article: 5177: 5174: 5162: 5159: 5155: 5151: 5148: 5145: 5140: 5137: 5105: 5101: 5097: 5094: 5091: 5086: 5083: 5080: 5050: 5047: 5044: 5039: 5036: 5030: 5026: 5022: 5018: 5015: 5012: 5007: 5004: 5001: 4996: 4992: 4963: 4959: 4955: 4952: 4949: 4944: 4941: 4938: 4911: 4907: 4904: 4893: 4892: 4881: 4877: 4872: 4868: 4865: 4861: 4856: 4850: 4847: 4844: 4841: 4839: 4836: 4833: 4830: 4827: 4826: 4823: 4820: 4817: 4814: 4812: 4809: 4806: 4803: 4802: 4800: 4795: 4790: 4787: 4784: 4781: 4778: 4773: 4770: 4755:rotation group 4726: 4722: 4718: 4715: 4712: 4707: 4704: 4701: 4696: 4693: 4684:is the set of 4672: 4668: 4665: 4656:of an element 4626: 4622: 4618: 4615: 4595: 4592: 4589: 4586: 4564: 4560: 4556: 4551: 4547: 4543: 4523: 4519: 4515: 4512: 4509: 4504: 4501: 4498: 4493: 4490: 4469: 4465: 4460: 4456: 4452: 4447: 4443: 4427: 4426: 4415: 4407: 4402: 4397: 4394: 4391: 4388: 4384: 4378: 4375: 4372: 4369: 4366: 4363: 4360: 4357: 4354: 4351: 4348: 4345: 4342: 4339: 4336: 4333: 4330: 4327: 4324: 4321: 4318: 4315: 4312: 4309: 4306: 4303: 4300: 4297: 4294: 4289: 4284: 4279: 4275: 4271: 4268: 4265: 4259: 4253: 4250: 4247: 4244: 4239: 4236: 4233: 4230: 4224: 4221: 4218: 4213: 4207: 4204: 4202: 4199: 4198: 4195: 4192: 4190: 4187: 4186: 4184: 4170:is defined by 4158: 4137: 4133: 4129: 4126: 4123: 4118: 4115: 4112: 4091: 4088: 4041: 4040: 4025: 4011: 4008: 4003: 4000: 3997: 3966: 3965: 3942: 3916: 3905: 3831: 3828: 3824: 3823: 3816: 3815: 3808: 3807: 3802: 3799: 3746: 3743: 3732: 3731: 3716: 3715: 3700: 3699: 3694: 3691: 3671: 3668: 3649: 3646: 3645: 3644: 3641: 3629: 3626: 3623: 3618: 3614: 3610: 3596: 3585: 3582: 3579: 3574: 3570: 3566: 3554: 3553: 3552: 3551: 3540: 3536: 3528: 3524: 3520: 3515: 3511: 3503: 3499: 3495: 3490: 3486: 3479: 3475: 3472: 3467: 3464: 3449: 3448: 3447: 3435: 3427: 3422: 3418: 3414: 3409: 3404: 3400: 3394: 3389: 3385: 3380: 3366: 3365: 3347: 3343: 3322: 3317: 3313: 3309: 3304: 3300: 3296: 3284: 3281: 3280: 3279: 3278: 3277: 3265: 3262: 3259: 3240: 3226: 3225: 3215: 3214: 3213: 3212: 3201: 3184: 3183: 3173: 3172: 3171: 3170: 3159: 3156: 3153: 3150: 3147: 3144: 3124: 3121: 3118: 3115: 3112: 3109: 3106: 3103: 3100: 3097: 3083: 3082: 3081:is modeled by: 3070: 3050: 3047: 3044: 3041: 3038: 3022: 3021: 3020: 3019: 3016: 3010: 3009: 3006:Straight lines 3002: 3001: 3000: 2999: 2975: 2972: 2969: 2958: 2948: 2947: 2937: 2934: 2913: 2910: 2907: 2902: 2899: 2896: 2889: 2886: 2880: 2877: 2871: 2868: 2865: 2862: 2836: 2833: 2829: 2806: 2803: 2800: 2795: 2792: 2788: 2784: 2779: 2773: 2767: 2764: 2758: 2755: 2749: 2743: 2740: 2736: 2733: 2730: 2727: 2724: 2721: 2718: 2715: 2712: 2709: 2706: 2703: 2700: 2695: 2691: 2687: 2684: 2681: 2678: 2675: 2670: 2666: 2662: 2659: 2656: 2653: 2632: 2629: 2609: 2604: 2600: 2596: 2591: 2587: 2583: 2578: 2574: 2568: 2564: 2560: 2557: 2554: 2530: 2527: 2524: 2519: 2515: 2511: 2489: 2483: 2480: 2474: 2468: 2464: 2460: 2455: 2451: 2446: 2439: 2436: 2433: 2430: 2426: 2422: 2419: 2416: 2411: 2407: 2403: 2400: 2397: 2394: 2391: 2386: 2382: 2378: 2374: 2370: 2367: 2349:{\textstyle y} 2345: 2323: 2319: 2315: 2310: 2306: 2302: 2299: 2296: 2293: 2290: 2285: 2281: 2277: 2274: 2271: 2267: 2263: 2259: 2251: 2247: 2241: 2237: 2231: 2228: 2224: 2220: 2217: 2214: 2209: 2205: 2201: 2198: 2195: 2192: 2189: 2184: 2180: 2176: 2173: 2170: 2167: 2164: 2161: 2143:{\textstyle x} 2139: 2110: 2106: 2099: 2094: 2090: 2086: 2081: 2077: 2073: 2070: 2065: 2061: 2057: 2052: 2048: 2044: 2039: 2034: 2030: 2026: 2021: 2017: 2013: 2010: 2005: 2001: 1997: 1992: 1988: 1984: 1978: 1975: 1971: 1967: 1964: 1959: 1955: 1951: 1946: 1942: 1938: 1935: 1932: 1908: 1904: 1881: 1877: 1856: 1853: 1850: 1847: 1842: 1838: 1834: 1831: 1826: 1822: 1801: 1798: 1795: 1790: 1786: 1782: 1779: 1774: 1770: 1743: 1739: 1716: 1712: 1683: 1680: 1660: 1657: 1652: 1648: 1644: 1639: 1635: 1631: 1628: 1625: 1619: 1616: 1610: 1607: 1604: 1601: 1598: 1593: 1589: 1585: 1580: 1576: 1572: 1569: 1566: 1538: 1535: 1510: 1506: 1503: 1500: 1497: 1494: 1490: 1486: 1483: 1480: 1477: 1474: 1470: 1466: 1463: 1458: 1455: 1450: 1447: 1444: 1441: 1415: 1408: 1405: 1400: 1396: 1390: 1387: 1382: 1377: 1374: 1371: 1368: 1365: 1362: 1343: 1338: 1334: 1311: 1307: 1278: 1274: 1268: 1264: 1260: 1255: 1251: 1247: 1244: 1239: 1235: 1229: 1225: 1221: 1216: 1212: 1208: 1203: 1200: 1195: 1191: 1187: 1182: 1178: 1174: 1148: 1138: 1134: 1128: 1124: 1118: 1113: 1108: 1101: 1098: 1091: 1086: 1082: 1078: 1075: 1072: 1067: 1063: 1059: 1054: 1050: 1046: 1040: 1037: 1034: 1031: 1028: 1026: 1024: 1018: 1013: 1006: 1003: 996: 991: 987: 983: 978: 973: 969: 965: 960: 956: 952: 946: 943: 940: 937: 934: 932: 930: 920: 916: 910: 906: 900: 895: 890: 886: 882: 877: 873: 869: 863: 860: 857: 854: 851: 849: 847: 842: 838: 834: 829: 825: 821: 818: 815: 812: 811: 779: 775: 754: 749: 745: 741: 738: 733: 729: 725: 722: 717: 710: 707: 683: 680: 677: 657: 652: 648: 644: 639: 635: 631: 628: 623: 619: 598: 593: 589: 585: 580: 576: 572: 569: 564: 560: 519: 513: 493: 486: 476: 467: 443: 440: 416:straight lines 408: 407: 392: 388: 381: 377: 373: 370: 367: 364: 359: 355: 351: 348: 345: 339: 334: 330: 326: 323: 320: 297: 294: 291: 288: 285: 282: 279: 276: 273: 270: 267: 264: 248: 245: 220: 217: 214: 187:This model is 178:equiconsistent 162:Henri Poincaré 151:imaginary part 115: 111: 107: 104: 101: 98: 95: 92: 89: 86: 83: 80: 77: 74: 71: 68: 65: 62: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 6383: 6372: 6369: 6367: 6364: 6362: 6359: 6358: 6356: 6345: 6344:0-387-98289-2 6341: 6337: 6333: 6330: 6327: 6326:0-86720-298-X 6323: 6319: 6315: 6312: 6309: 6308:3-540-43299-X 6305: 6301: 6297: 6294: 6291: 6290:0-387-90465-4 6287: 6283: 6279: 6275: 6272: 6271:archived copy 6268: 6267: 6262: 6259: 6256: 6252: 6248: 6245: 6244: 6239: 6238: 6229: 6226: 6214: 6210: 6203: 6200: 6187: 6181: 6178: 6171: 6170: 6166: 6161: 6158: 6156: 6153: 6151: 6148: 6146: 6143: 6141: 6138: 6136: 6133: 6131: 6128: 6126: 6123: 6121: 6118: 6116: 6113: 6112: 6107: 6105: 6103: 6099: 6095: 6079: 6076: 6073: 6061: 6058:The model in 6057: 6055: 6042: 6032: 6028: 6022: 6018: 6012: 6002: 5998: 5994: 5989: 5985: 5975: 5972: 5969: 5966: 5958: 5954: 5950: 5945: 5941: 5934: 5931: 5923: 5904: 5900: 5896: 5891: 5887: 5883: 5878: 5874: 5867: 5862: 5858: 5832: 5828: 5824: 5819: 5815: 5811: 5806: 5802: 5795: 5790: 5786: 5777: 5772: 5770: 5766: 5762: 5758: 5754: 5750: 5745: 5727: 5723: 5716: 5708: 5705: 5699: 5694: 5686: 5683: 5677: 5672: 5664: 5661: 5652: 5647: 5639: 5636: 5625: 5608: 5605: 5602: 5599: 5593: 5590: 5587: 5584: 5581: 5567: 5559: 5557: 5555: 5551: 5547: 5543: 5542:geodesic flow 5524: 5518: 5515: 5510: 5506: 5502: 5499: 5494: 5491: 5486: 5482: 5478: 5475: 5469: 5466: 5463: 5458: 5450: 5446: 5442: 5439: 5435: 5429: 5422: 5415: 5411: 5407: 5403: 5396: 5389: 5383: 5378: 5371: 5366: 5360: 5355: 5349: 5343: 5336: 5335: 5334: 5332: 5328: 5309: 5304: 5300: 5296: 5293: 5290: 5287: 5282: 5274: 5270: 5266: 5263: 5259: 5253: 5246: 5239: 5235: 5231: 5227: 5220: 5215: 5209: 5203: 5196: 5195: 5194: 5192: 5187: 5183: 5175: 5173: 5160: 5149: 5146: 5126: 5125:modular group 5122: 5117: 5095: 5092: 5068: 5064: 5045: 5028: 5016: 5013: 4994: 4981: 4977: 4953: 4950: 4926: 4923:is mapped to 4905: 4902: 4879: 4875: 4866: 4863: 4859: 4854: 4848: 4845: 4842: 4837: 4834: 4831: 4828: 4821: 4818: 4815: 4810: 4807: 4804: 4798: 4793: 4785: 4779: 4759: 4758: 4757: 4756: 4752: 4748: 4744: 4740: 4716: 4713: 4694: 4691: 4666: 4663: 4655: 4651: 4646: 4644: 4640: 4624: 4616: 4613: 4593: 4590: 4587: 4584: 4562: 4558: 4554: 4549: 4545: 4541: 4513: 4510: 4491: 4488: 4463: 4458: 4454: 4450: 4445: 4441: 4432: 4413: 4405: 4395: 4392: 4389: 4386: 4373: 4361: 4358: 4355: 4352: 4349: 4343: 4340: 4331: 4319: 4316: 4313: 4310: 4307: 4301: 4298: 4295: 4292: 4287: 4277: 4269: 4266: 4257: 4251: 4248: 4245: 4242: 4237: 4234: 4231: 4228: 4222: 4219: 4216: 4211: 4205: 4200: 4193: 4188: 4182: 4173: 4172: 4171: 4127: 4124: 4101: 4097: 4089: 4087: 4085: 4081: 4077: 4073: 4069: 4065: 4064:modular forms 4061: 4057: 4053: 4052:modular group 4048: 4046: 4038: 4034: 4030: 4026: 4006: 4001: 3995: 3987: 3983: 3979: 3975: 3971: 3970: 3969: 3963: 3959: 3955: 3951: 3947: 3943: 3940: 3936: 3932: 3928: 3926: 3921: 3917: 3914: 3910: 3906: 3903: 3899: 3895: 3893: 3888: 3884: 3883: 3882: 3880: 3875: 3873: 3869: 3865: 3861: 3857: 3853: 3849: 3841: 3836: 3829: 3827: 3821: 3820: 3819: 3813: 3812: 3811: 3805: 3804: 3800: 3798: 3796: 3792: 3787: 3785: 3781: 3776: 3774: 3769: 3767: 3763: 3758: 3756: 3752: 3744: 3742: 3739: 3737: 3729: 3728: 3727: 3723: 3721: 3713: 3712: 3711: 3709: 3705: 3697: 3696: 3692: 3690: 3688: 3683: 3681: 3677: 3669: 3667: 3665: 3661: 3655: 3647: 3642: 3624: 3621: 3616: 3612: 3601: 3597: 3580: 3577: 3572: 3568: 3556: 3555: 3538: 3534: 3526: 3522: 3518: 3513: 3509: 3501: 3497: 3493: 3488: 3484: 3477: 3473: 3470: 3465: 3462: 3453: 3452: 3450: 3433: 3425: 3420: 3416: 3412: 3407: 3402: 3398: 3392: 3387: 3383: 3378: 3370: 3369: 3368: 3367: 3363: 3362: 3361: 3360:represents: 3345: 3341: 3315: 3311: 3307: 3302: 3298: 3282: 3260: 3257: 3249: 3245: 3241: 3238: 3234: 3230: 3229: 3228: 3227: 3223: 3222: 3217: 3216: 3210: 3206: 3202: 3200: 3196: 3192: 3188: 3187: 3186: 3185: 3181: 3180: 3175: 3174: 3154: 3148: 3145: 3142: 3116: 3110: 3107: 3104: 3101: 3098: 3087: 3086: 3085: 3084: 3068: 3045: 3042: 3039: 3028: 3024: 3023: 3017: 3014: 3013: 3012: 3011: 3007: 3004: 3003: 2997: 2993: 2989: 2986:which is the 2970: 2967: 2959: 2956: 2952: 2951: 2950: 2949: 2945: 2944: 2940: 2939: 2935: 2933: 2931: 2911: 2908: 2905: 2900: 2897: 2894: 2887: 2884: 2878: 2875: 2869: 2866: 2863: 2860: 2852: 2834: 2831: 2827: 2817: 2804: 2801: 2798: 2793: 2790: 2786: 2782: 2771: 2765: 2762: 2756: 2753: 2741: 2738: 2734: 2725: 2722: 2719: 2716: 2713: 2710: 2707: 2704: 2701: 2698: 2693: 2689: 2682: 2676: 2673: 2668: 2664: 2654: 2651: 2643: 2630: 2627: 2607: 2602: 2598: 2594: 2589: 2585: 2581: 2576: 2566: 2562: 2558: 2555: 2544: 2525: 2522: 2517: 2513: 2500: 2487: 2481: 2478: 2466: 2462: 2458: 2453: 2449: 2437: 2434: 2431: 2428: 2424: 2417: 2414: 2409: 2405: 2398: 2392: 2389: 2384: 2380: 2372: 2368: 2365: 2357: 2343: 2334: 2321: 2317: 2308: 2304: 2297: 2294: 2291: 2283: 2279: 2272: 2269: 2265: 2261: 2257: 2249: 2245: 2239: 2235: 2229: 2226: 2222: 2218: 2207: 2203: 2199: 2196: 2190: 2182: 2178: 2174: 2171: 2162: 2159: 2151: 2137: 2128: 2126: 2121: 2108: 2104: 2092: 2088: 2084: 2079: 2075: 2063: 2059: 2055: 2050: 2046: 2032: 2028: 2024: 2019: 2015: 2003: 1999: 1995: 1990: 1986: 1976: 1973: 1969: 1965: 1957: 1953: 1949: 1944: 1940: 1933: 1930: 1922: 1906: 1902: 1879: 1875: 1854: 1848: 1845: 1840: 1836: 1829: 1824: 1820: 1796: 1793: 1788: 1784: 1777: 1772: 1768: 1759: 1741: 1737: 1714: 1710: 1700: 1697: 1681: 1678: 1658: 1650: 1646: 1642: 1637: 1633: 1626: 1623: 1617: 1614: 1608: 1605: 1602: 1599: 1591: 1587: 1583: 1578: 1574: 1567: 1564: 1556: 1552: 1536: 1533: 1525: 1508: 1501: 1498: 1495: 1488: 1481: 1478: 1475: 1468: 1464: 1461: 1456: 1453: 1448: 1445: 1442: 1439: 1431: 1406: 1403: 1398: 1394: 1388: 1385: 1375: 1372: 1369: 1366: 1363: 1360: 1341: 1336: 1332: 1309: 1305: 1296: 1276: 1266: 1262: 1258: 1253: 1249: 1242: 1237: 1227: 1223: 1219: 1214: 1210: 1201: 1193: 1189: 1185: 1180: 1176: 1163: 1146: 1136: 1132: 1126: 1122: 1116: 1106: 1096: 1089: 1084: 1080: 1073: 1065: 1061: 1057: 1052: 1048: 1038: 1035: 1032: 1029: 1027: 1011: 1001: 994: 989: 985: 971: 967: 963: 958: 954: 944: 941: 938: 935: 933: 918: 914: 908: 904: 898: 888: 884: 880: 875: 871: 861: 858: 855: 852: 850: 840: 836: 832: 827: 823: 816: 813: 801: 799: 795: 777: 773: 747: 743: 739: 736: 731: 727: 720: 715: 705: 681: 678: 675: 650: 646: 642: 637: 633: 626: 621: 617: 591: 587: 583: 578: 574: 567: 562: 558: 545: 540: 532: 518: 512: 508: 504: 492: 485: 475: 466: 448: 441: 439: 437: 433: 429: 425: 424:perpendicular 421: 417: 413: 390: 386: 379: 371: 368: 362: 357: 349: 346: 337: 332: 324: 321: 311: 310: 309: 295: 289: 286: 283: 280: 274: 271: 268: 254: 246: 244: 242: 238: 234: 218: 215: 212: 203: 201: 197: 192: 190: 185: 183: 179: 175: 171: 167: 163: 158: 156: 152: 148: 147:complex plane 143: 141: 137: 133: 129: 105: 102: 99: 96: 93: 90: 87: 84: 81: 75: 72: 69: 60: 53: 49: 45: 41: 32: 19: 6335: 6317: 6316:Saul Stahl, 6310: 6299: 6281: 6264: 6250: 6228: 6216:. Retrieved 6212: 6202: 6192:19 September 6190:. Retrieved 6180: 6150:Pseudosphere 6101: 6097: 6092:dimensional 6065: 6059: 5924: 5775: 5773: 5768: 5764: 5760: 5752: 5748: 5746: 5626: 5624:is given by 5563: 5539: 5330: 5326: 5324: 5193:is given by 5190: 5188: 5185: 5118: 4975: 4924: 4894: 4750: 4746: 4742: 4738: 4737:which leave 4653: 4647: 4642: 4638: 4428: 4096:group action 4093: 4083: 4079: 4075: 4071: 4055: 4049: 4042: 4036: 4032: 4028: 3985: 3981: 3977: 3967: 3961: 3957: 3953: 3949: 3945: 3938: 3934: 3930: 3924: 3912: 3908: 3901: 3897: 3891: 3876: 3868:transitively 3863: 3859: 3851: 3845: 3842:of the model 3825: 3817: 3809: 3794: 3790: 3788: 3783: 3782:with center 3779: 3777: 3772: 3770: 3765: 3761: 3759: 3754: 3750: 3748: 3740: 3735: 3733: 3724: 3719: 3717: 3707: 3703: 3701: 3686: 3684: 3679: 3675: 3673: 3657: 3286: 3243: 3232: 3219: 3204: 3195:ideal points 3190: 3177: 3026: 3005: 2995: 2954: 2943:Ideal points 2941: 2818: 2644: 2501: 2358: 2356:coordinate: 2335: 2152: 2150:coordinate: 2129: 2122: 1923: 1757: 1701: 1164: 802: 797: 793: 549: 516: 510: 506: 502: 490: 483: 473: 464: 435: 431: 427: 415: 411: 409: 250: 240: 236: 231:dimensional 204: 198:provides an 193: 186: 159: 154: 144: 51: 43: 37: 6296:Jürgen Jost 6120:Anosov flow 5554:Anosov flow 5546:line bundle 5182:Anosov flow 4741:unchanged: 3797:intersect. 3451:and radius 3333:and radius 3248:ideal point 3237:ideal point 3135:and radius 3061:and radius 2988:ideal point 2125:Cross-ratio 792:across the 170:Klein model 6355:Categories 6167:References 6062:dimensions 4980:isomorphic 4650:stabilizer 4534:such that 4433:: for any 4431:transitive 3974:isometries 3879:Lie groups 3760:Let point 3652:See also: 3600:orthogonal 3179:hypercycle 2992:orthogonal 2957:-axis, and 2502:One point 149:where the 6278:Irwin Kra 6008:‖ 5995:− 5982:‖ 5976:⁡ 5935:⁡ 5910:⟩ 5871:⟨ 5838:⟩ 5799:⟨ 5757:geodesics 5600:∣ 5597:⟩ 5579:⟨ 5464:⋅ 5440:− 5344:γ 5288:⋅ 5264:− 5204:γ 5176:Geodesics 4906:∈ 4867:∈ 4864:θ 4849:θ 4846:⁡ 4838:θ 4835:⁡ 4829:− 4822:θ 4819:⁡ 4811:θ 4808:⁡ 4695:∈ 4667:∈ 4617:∈ 4492:∈ 4464:∈ 4368:ℑ 4356:− 4326:ℜ 4217:⋅ 4010:¯ 4002:− 3999:→ 3948:) = SL(2, 3519:− 3474:⁡ 3413:− 3321:⟩ 3295:⟨ 3264:∞ 3221:horocycle 3149:⁡ 3111:⁡ 2974:∞ 2909:− 2888:⁡ 2864:⁡ 2832:− 2802:ϕ 2799:⁡ 2791:− 2772:ϕ 2757:⁡ 2729:⟩ 2726:ϕ 2723:⁡ 2711:ϕ 2708:⁡ 2699:± 2686:⟨ 2680:⟩ 2661:⟨ 2655:⁡ 2628:ϕ 2559:− 2529:⟩ 2510:⟨ 2459:− 2438:⁡ 2421:⟩ 2402:⟨ 2396:⟩ 2377:⟨ 2369:⁡ 2298:⁡ 2292:− 2273:⁡ 2230:⁡ 2213:⟩ 2194:⟨ 2188:⟩ 2169:⟨ 2163:⁡ 2098:‖ 2085:− 2072:‖ 2069:‖ 2056:− 2043:‖ 2038:‖ 2025:− 2012:‖ 2009:‖ 1996:− 1983:‖ 1977:⁡ 1934:⁡ 1852:⟩ 1833:⟨ 1800:⟩ 1781:⟨ 1627:⁡ 1609:⁡ 1568:⁡ 1499:− 1465:⁡ 1443:⁡ 1376:⁡ 1364:⁡ 1259:− 1220:− 1199:‖ 1186:− 1173:‖ 1112:‖ 1100:~ 1090:− 1077:‖ 1071:‖ 1058:− 1045:‖ 1039:⁡ 1017:‖ 1005:~ 995:− 982:‖ 977:‖ 964:− 951:‖ 945:⁡ 894:‖ 881:− 868:‖ 862:⁡ 817:⁡ 753:⟩ 740:− 724:⟨ 709:~ 656:⟩ 630:⟨ 597:⟩ 571:⟨ 420:geodesics 281:∣ 278:⟩ 266:⟨ 189:conformal 106:∈ 82:∣ 79:⟩ 67:⟨ 6108:See also 5776:distance 5771:-plane. 4606:for all 3956:}=PGL(2, 3768:- axis. 798:distance 200:isometry 172:and the 6334:(1998) 6240:Sources 6218:25 June 5123:by the 4753:is the 4098:of the 4060:lattice 3929:= SL(2, 3757:-axis. 3689:-axis. 3682:-axis. 2994:to the 2928:is the 2541:at the 1526:. This 1522:is the 1428:is the 1293:is the 496:) = log 438:-axis. 426:to the 46:is the 6342:  6324:  6306:  6288:  5973:arsinh 5747:where 5566:metric 5063:bundle 3923:PSL(2, 3850:PGL(2, 3027:circle 2861:artanh 2853:, and 2819:where 2742:artanh 2435:arsinh 1682:artanh 1537:arsinh 1440:artanh 1432:, and 1361:arsinh 1165:where 942:artanh 859:arsinh 410:where 253:metric 247:Metric 130:, the 128:metric 42:, the 6172:Notes 5769:z = 0 5765:z = 0 5761:z = 0 4637:then 4054:SL(2, 3890:SL(2, 3209:angle 3199:angle 1565:chord 1551:chord 482:dist( 180:with 153:(the 136:model 6340:ISBN 6322:ISBN 6304:ISBN 6286:ISBN 6220:2015 6194:2015 5932:dist 5850:and 5774:The 5606:> 5564:The 4648:The 4094:The 4066:and 3952:)/{± 3933:)/{± 3918:The 3885:The 3846:The 3793:and 3704:line 3146:sinh 3108:cosh 2652:dist 2543:apex 2366:dist 2160:dist 2123:Cf. 1931:dist 1921:is: 1812:and 1729:and 1624:dist 1606:sinh 1324:and 814:dist 694:and 679:> 609:and 471:and 308:is: 287:> 251:The 194:The 88:> 4978:is 4843:cos 4832:sin 4816:sin 4805:cos 4652:or 4148:on 3976:of 3250:at 2754:tan 2720:cos 2705:sin 1894:to 550:If 38:In 6357:: 6298:, 6280:, 6253:, 6249:, 6211:. 5556:. 5116:. 4745:= 4743:gz 4645:. 4641:= 4047:. 4039:). 3904:). 3874:. 3775:. 3471:ln 3218:A 3176:A 3025:A 2932:. 2885:ln 2828:gd 2787:gd 2295:ln 2270:ln 2227:ln 2127:. 1974:ln 1557:, 1462:ln 1373:ln 1036:ln 509:)/ 505:+ 489:, 184:. 142:. 6328:. 6313:. 6292:. 6222:. 6196:. 6102:n 6098:x 6080:1 6077:+ 6074:n 6060:n 6043:. 6033:2 6029:z 6023:1 6019:z 6013:2 6003:1 5999:p 5990:2 5986:p 5970:2 5967:= 5964:) 5959:2 5955:p 5951:, 5946:1 5942:p 5938:( 5905:2 5901:z 5897:, 5892:2 5888:y 5884:, 5879:2 5875:x 5868:= 5863:2 5859:p 5833:1 5829:z 5825:, 5820:1 5816:y 5812:, 5807:1 5803:x 5796:= 5791:1 5787:p 5749:s 5728:2 5724:z 5717:2 5713:) 5709:z 5706:d 5703:( 5700:+ 5695:2 5691:) 5687:y 5684:d 5681:( 5678:+ 5673:2 5669:) 5665:x 5662:d 5659:( 5653:= 5648:2 5644:) 5640:s 5637:d 5634:( 5612:} 5609:0 5603:z 5594:z 5591:, 5588:y 5585:, 5582:x 5576:{ 5525:. 5519:d 5516:+ 5511:t 5507:e 5503:i 5500:c 5495:b 5492:+ 5487:t 5483:e 5479:i 5476:a 5470:= 5467:i 5459:) 5451:2 5447:/ 5443:t 5436:e 5430:0 5423:0 5416:2 5412:/ 5408:t 5404:e 5397:( 5390:) 5384:d 5379:c 5372:b 5367:a 5361:( 5356:= 5353:) 5350:t 5347:( 5331:R 5327:R 5310:. 5305:t 5301:e 5297:i 5294:= 5291:i 5283:) 5275:2 5271:/ 5267:t 5260:e 5254:0 5247:0 5240:2 5236:/ 5232:t 5228:e 5221:( 5216:= 5213:) 5210:t 5207:( 5191:i 5161:. 5158:) 5154:Z 5150:, 5147:2 5144:( 5139:L 5136:S 5104:) 5100:R 5096:, 5093:2 5090:( 5085:L 5082:S 5079:P 5049:) 5046:2 5043:( 5038:O 5035:S 5029:/ 5025:) 5021:R 5017:, 5014:2 5011:( 5006:L 5003:S 5000:P 4995:= 4991:H 4976:z 4962:) 4958:R 4954:, 4951:2 4948:( 4943:L 4940:S 4937:P 4925:i 4910:H 4903:z 4880:. 4876:} 4871:R 4860:| 4855:) 4799:( 4794:{ 4786:= 4783:) 4780:2 4777:( 4772:O 4769:S 4751:i 4747:z 4739:z 4725:) 4721:R 4717:, 4714:2 4711:( 4706:L 4703:S 4700:P 4692:g 4671:H 4664:z 4643:e 4639:g 4625:, 4621:H 4614:z 4594:z 4591:= 4588:z 4585:g 4563:2 4559:z 4555:= 4550:1 4546:z 4542:g 4522:) 4518:R 4514:, 4511:2 4508:( 4503:L 4500:S 4497:P 4489:g 4468:H 4459:2 4455:z 4451:, 4446:1 4442:z 4414:. 4406:2 4401:| 4396:d 4393:+ 4390:z 4387:c 4383:| 4377:) 4374:z 4371:( 4365:) 4362:c 4359:b 4353:d 4350:a 4347:( 4344:i 4341:+ 4338:) 4335:) 4332:z 4329:( 4323:) 4320:c 4317:b 4314:+ 4311:d 4308:a 4305:( 4302:+ 4299:d 4296:b 4293:+ 4288:2 4283:| 4278:z 4274:| 4270:c 4267:a 4264:( 4258:= 4252:d 4249:+ 4246:z 4243:c 4238:b 4235:+ 4232:z 4229:a 4223:= 4220:z 4212:) 4206:d 4201:c 4194:b 4189:a 4183:( 4157:H 4136:) 4132:R 4128:, 4125:2 4122:( 4117:L 4114:S 4111:P 4084:Z 4080:R 4076:Z 4072:Z 4056:Z 4037:R 4033:H 4029:H 4024:. 4007:z 3996:z 3986:R 3982:H 3978:H 3962:R 3958:R 3954:I 3950:R 3946:R 3939:R 3935:I 3931:R 3927:) 3925:R 3913:R 3909:R 3902:R 3898:R 3894:) 3892:R 3864:R 3860:H 3852:C 3795:p 3791:h 3784:q 3780:h 3773:q 3766:x 3762:q 3755:x 3751:p 3736:x 3720:x 3708:x 3687:x 3680:x 3676:x 3628:) 3625:0 3622:= 3617:e 3613:y 3609:( 3584:) 3581:0 3578:, 3573:e 3569:x 3565:( 3539:. 3535:) 3527:e 3523:r 3514:e 3510:y 3502:e 3498:r 3494:+ 3489:e 3485:y 3478:( 3466:2 3463:1 3434:) 3426:2 3421:e 3417:r 3408:2 3403:e 3399:y 3393:, 3388:e 3384:x 3379:( 3346:e 3342:r 3316:e 3312:y 3308:, 3303:e 3299:x 3276:. 3261:= 3258:y 3244:x 3233:x 3211:. 3205:x 3191:x 3158:) 3155:r 3152:( 3143:y 3123:) 3120:) 3117:r 3114:( 3105:y 3102:, 3099:x 3096:( 3069:r 3049:) 3046:y 3043:, 3040:x 3037:( 2996:x 2971:= 2968:y 2955:x 2912:x 2906:1 2901:x 2898:+ 2895:1 2879:2 2876:1 2870:= 2867:x 2835:1 2805:, 2794:1 2783:= 2778:) 2766:2 2763:1 2748:( 2739:2 2735:= 2732:) 2717:r 2714:, 2702:r 2694:1 2690:x 2683:, 2677:r 2674:, 2669:1 2665:x 2658:( 2631:. 2608:, 2603:2 2599:r 2595:= 2590:2 2586:y 2582:+ 2577:2 2573:) 2567:1 2563:x 2556:x 2553:( 2526:r 2523:, 2518:1 2514:x 2488:. 2482:y 2479:2 2473:| 2467:1 2463:x 2454:2 2450:x 2445:| 2432:2 2429:= 2425:) 2418:y 2415:, 2410:2 2406:x 2399:, 2393:y 2390:, 2385:1 2381:x 2373:( 2344:y 2322:. 2318:| 2314:) 2309:1 2305:y 2301:( 2289:) 2284:2 2280:y 2276:( 2266:| 2262:= 2258:| 2250:1 2246:y 2240:2 2236:y 2223:| 2219:= 2216:) 2208:2 2204:y 2200:, 2197:x 2191:, 2183:1 2179:y 2175:, 2172:x 2166:( 2138:x 2109:. 2105:| 2093:3 2089:p 2080:2 2076:p 2064:0 2060:p 2051:1 2047:p 2033:3 2029:p 2020:1 2016:p 2004:0 2000:p 1991:2 1987:p 1970:| 1966:= 1963:) 1958:2 1954:p 1950:, 1945:1 1941:p 1937:( 1907:2 1903:p 1880:1 1876:p 1855:, 1849:0 1846:, 1841:3 1837:x 1830:= 1825:3 1821:p 1797:0 1794:, 1789:0 1785:x 1778:= 1773:0 1769:p 1758:x 1742:2 1738:p 1715:1 1711:p 1679:2 1659:, 1656:) 1651:2 1647:p 1643:, 1638:1 1634:p 1630:( 1618:2 1615:1 1603:2 1600:= 1597:) 1592:2 1588:p 1584:, 1579:1 1575:p 1571:( 1534:2 1509:) 1505:) 1502:x 1496:1 1493:( 1489:/ 1485:) 1482:x 1479:+ 1476:1 1473:( 1469:( 1457:2 1454:1 1449:= 1446:x 1414:) 1407:1 1404:+ 1399:2 1395:x 1389:+ 1386:x 1381:( 1370:= 1367:x 1342:, 1337:2 1333:p 1310:1 1306:p 1277:2 1273:) 1267:1 1263:y 1254:2 1250:y 1246:( 1243:+ 1238:2 1234:) 1228:1 1224:x 1215:2 1211:x 1207:( 1202:= 1194:1 1190:p 1181:2 1177:p 1147:, 1137:2 1133:y 1127:1 1123:y 1117:2 1107:1 1097:p 1085:2 1081:p 1074:+ 1066:1 1062:p 1053:2 1049:p 1033:2 1030:= 1012:1 1002:p 990:2 986:p 972:1 968:p 959:2 955:p 939:2 936:= 919:2 915:y 909:1 905:y 899:2 889:1 885:p 876:2 872:p 856:2 853:= 846:) 841:2 837:p 833:, 828:1 824:p 820:( 794:x 778:1 774:p 748:1 744:y 737:, 732:1 728:x 721:= 716:1 706:p 682:0 676:y 651:2 647:y 643:, 638:2 634:x 627:= 622:2 618:p 592:1 588:y 584:, 579:1 575:x 568:= 563:1 559:p 524:) 520:2 517:h 514:1 511:h 507:d 503:s 501:( 498:( 494:2 491:p 487:1 484:p 477:2 474:h 468:1 465:h 460:d 456:s 452:x 436:x 432:x 428:x 412:s 391:2 387:y 380:2 376:) 372:y 369:d 366:( 363:+ 358:2 354:) 350:x 347:d 344:( 338:= 333:2 329:) 325:s 322:d 319:( 296:, 293:} 290:0 284:y 275:y 272:, 269:x 263:{ 241:n 237:x 219:1 216:+ 213:n 155:y 114:} 110:R 103:y 100:, 97:x 94:; 91:0 85:y 76:y 73:, 70:x 64:{ 61:= 52:H 20:)

Index

Poincaré half-space model

non-Euclidean geometry
upper half-plane
metric
Poincaré metric
model
hyperbolic geometry
complex plane
imaginary part
Henri Poincaré
Eugenio Beltrami
Klein model
Poincaré disk model
equiconsistent
Euclidean geometry
conformal
Cayley transform
isometry
hyperbolic space
metric
geodesics
perpendicular



Gudermannian function
Euclidean distance
inverse hyperbolic sine
inverse hyperbolic tangent

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