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Dihedron

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bases are connected "back-to-back", so that the resulting object has no depth. The polygons must be congruent, but glued in such a way that one is the mirror image of the other. This applies only if the distance between the two faces is zero; for a distance larger than zero, the faces are infinite
406:. This characterization holds also for the distances on the surface of a dihedron, so the statement of Alexandrov's theorem requires that dihedra be considered as convex polyhedra. 1743: 398:, which characterizes the distances on the surface of any convex polyhedron as being locally Euclidean except at a finite number of points with positive 1736: 1063:
Gausmann, Evelise; Roland Lehoucq; Jean-Pierre Luminet; Jean-Philippe Uzan; Jeffrey Weeks (2001). "Topological Lensing in Spherical Spaces".
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Some dihedra can arise as lower limit members of other polyhedra families: a
2103: 2093: 2038: 2022: 1858: 1685: 1319: 880: 1044: 871: 391:'s digon faces, having a width larger than zero, are infinite stripes). 2113: 2088: 1690: 847: 383: 263: 17: 1077: 479:
is made of two regular spherical polygons which share the same set of
865: 469: 325: 1721: 1215: 1180: 853: 414: 359: 1781: 1725: 1332: 1118:"On the volume of unbounded polyhedra in the hyperbolic space" 1328: 985:-dimensional analogue of a dihedron, with Schläfli symbol { 490:
The regular polyhedron {2,2} is self-dual, and is both a
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equator; each polygon of a spherical dihedron fills a
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On flat polyhedra deriving from Alexandrov's theorem
324:-sided faces covering the sphere, each face being a 2056: 2031: 2006: 1981: 1897: 1805: 1760: 1670: 1641: 1606: 1554: 1495: 1434: 1373: 502:22 symmetry mutations of regular dihedral tilings: 233: 210: 186: 150: 136: 122: 106: 94: 82: 68: 53: 32: 421:with a digon base would be a triangular dihedron. 281:if its faces are flat, while in three-dimensional 1246:(3rd ed.), Dover Publications Inc., p.  1172:Flat zipper-unfolding pairs for Platonic solids 1737: 1344: 8: 2010: 1744: 1730: 1722: 1351: 1337: 1329: 320:can exist as nondegenerate form, with two 42: 1214: 1179: 1076: 496: 417:bases would be a square dihedron, and a 1055: 48:Example hexagonal dihedron on a sphere 29: 1162: 1160: 7: 336:if the vertices are equally spaced. 1368:Listed by number of faces and type 1125:Beiträge zur Algebra und Geometrie 266:faces which share the same set of 25: 1273:; Schulte, Egon (December 2002), 297:). Dihedra have also been called 965: 963:as a 2-dimensional tessellation: 833: 828: 823: 818: 813: 801: 796: 791: 786: 781: 772: 767: 762: 757: 752: 743: 738: 733: 728: 723: 714: 709: 704: 699: 694: 685: 680: 675: 670: 665: 618: 608: 601: 594: 587: 580: 177: 172: 167: 162: 157: 396:Alexandrov's uniqueness theorem 374:can be considered a degenerate 483:vertices, equally spaced on a 1: 1579:(two infinite groups and 75) 1065:Classical and Quantum Gravity 498:Family of regular dihedra ¡ * 2124:Degenerate polyhedra are in 1597:(two infinite groups and 50) 460:which share the same set of 1943:pentagonal icositetrahedron 1884:truncated icosidodecahedron 1095:10.1088/0264-9381/18/23/311 959:-gonal dihedron becomes an 2167: 1973:pentagonal hexecontahedron 1933:deltoidal icositetrahedron 1281:Cambridge University Press 1276:Abstract Regular Polytopes 477:regular spherical dihedron 366:As a flat-faced polyhedron 362:faces share two vertices. 2122: 2013: 1968:disdyakis triacontahedron 1963:deltoidal hexecontahedron 1649:Kepler–Poinsot polyhedron 1366: 512: 448:As a tiling of the sphere 387:polygons (a bit like the 41: 428:, with Schläfli symbol { 2074:gyroelongated bipyramid 1948:rhombic triacontahedron 1854:truncated cuboctahedron 1661:Uniform star polyhedron 1589:quasiregular polyhedron 394:Dihedra can arise from 307:doubly covered polygons 273:. In three-dimensional 27:Polyhedron with 2 faces 2069:truncated trapezohedra 1938:disdyakis dodecahedron 1904:(duals of Archimedean) 1879:rhombicosidodecahedron 1869:truncated dodecahedron 1595:semiregular polyhedron 955:tends to infinity, an 389:apeirogonal hosohedron 347:-gonal dihedron is an 1958:pentakis dodecahedron 1874:truncated icosahedron 1829:truncated tetrahedron 1642:non-convex polyhedron 1918:rhombic dodecahedron 1844:truncated octahedron 961:apeirogonal dihedron 947:Apeirogonal dihedron 432:,2}, is made of two 328:, and vertices on a 108:Vertex configuration 1953:triakis icosahedron 1928:tetrakis hexahedron 1913:triakis tetrahedron 1849:rhombicuboctahedron 1225:2010arXiv1007.2016O 1190:2010arXiv1010.2450O 1116:KĂĄntor, S. (2003), 1087:2001CQGra..18.5155G 1013:}, which share all 506: 378:whose two (planar) 1923:triakis octahedron 1808:Archimedean solids 1583:regular polyhedron 1577:uniform polyhedron 1539:Hectotriadiohedron 1312:Weisstein, Eric W. 497: 458:spherical polygons 454:spherical dihedron 2151:Regular polyhedra 2133: 2132: 2052: 2051: 1889:snub dodecahedron 1864:icosidodecahedron 1719: 1718: 1620:Archimedean solid 1607:convex polyhedron 1515:Icosidodecahedron 1243:Regular Polytopes 1238:Coxeter, H. S. M. 1071:(23): 5155–5186. 944: 943: 252: 251: 16:(Redirected from 2158: 2011: 2007:Dihedral uniform 1982:Dihedral regular 1905: 1821: 1770: 1746: 1739: 1732: 1723: 1555:elemental things 1533:Enneacontahedron 1503:Icositetrahedron 1353: 1346: 1339: 1330: 1325: 1324: 1298: 1297: 1279:(1st ed.), 1267: 1261: 1260: 1240:(January 1973), 1234: 1228: 1227: 1218: 1203:O'Rourke, Joseph 1199: 1193: 1192: 1183: 1168:O'Rourke, Joseph 1164: 1155: 1153: 1152: 1151: 1145: 1139:, archived from 1122: 1113: 1107: 1106: 1080: 1060: 997:,2}. It has two 969: 838: 837: 836: 832: 831: 827: 826: 822: 821: 817: 816: 806: 805: 804: 800: 799: 795: 794: 790: 789: 785: 784: 777: 776: 775: 771: 770: 766: 765: 761: 760: 756: 755: 748: 747: 746: 742: 741: 737: 736: 732: 731: 727: 726: 719: 718: 717: 713: 712: 708: 707: 703: 702: 698: 697: 690: 689: 688: 684: 683: 679: 678: 674: 673: 669: 668: 622: 612: 605: 598: 591: 584: 507: 494:and a dihedron. 434:regular polygons 426:regular dihedron 405: 314:spherical tiling 182: 181: 180: 176: 175: 171: 170: 166: 165: 161: 160: 63:spherical tiling 46: 30: 21: 2166: 2165: 2161: 2160: 2159: 2157: 2156: 2155: 2136: 2135: 2134: 2129: 2118: 2057:Dihedral others 2048: 2027: 2002: 1977: 1906: 1903: 1902: 1893: 1822: 1811: 1810: 1801: 1764: 1762:Platonic solids 1756: 1750: 1720: 1715: 1666: 1655:Star polyhedron 1637: 1602: 1550: 1527:Hexecontahedron 1509:Triacontahedron 1491: 1482:Enneadecahedron 1472:Heptadecahedron 1462:Pentadecahedron 1457:Tetradecahedron 1430: 1369: 1362: 1357: 1310: 1309: 1306: 1301: 1295: 1271:McMullen, Peter 1269: 1268: 1264: 1258: 1236: 1235: 1231: 1201: 1200: 1196: 1166: 1165: 1158: 1149: 1147: 1143: 1120: 1115: 1114: 1110: 1062: 1061: 1057: 1053: 1031: 975: 964: 949: 917: 888: 834: 829: 824: 819: 814: 812: 802: 797: 792: 787: 782: 780: 773: 768: 763: 758: 753: 751: 744: 739: 734: 729: 724: 722: 715: 710: 705: 700: 695: 693: 686: 681: 676: 671: 666: 664: 659: 629: 576: 568: 558: 551: 544: 537: 530: 524: 464:vertices, on a 456:is made of two 450: 438:Schläfli symbol 403: 368: 283:spherical space 275:Euclidean space 235:Dual polyhedron 221: 198: 178: 173: 168: 163: 158: 156: 152:Coxeter diagram 138:Schläfli symbol 49: 33:Set of regular 28: 23: 22: 15: 12: 11: 5: 2164: 2162: 2154: 2153: 2148: 2138: 2137: 2131: 2130: 2123: 2120: 2119: 2117: 2116: 2111: 2106: 2101: 2096: 2091: 2086: 2081: 2076: 2071: 2066: 2060: 2058: 2054: 2053: 2050: 2049: 2047: 2046: 2041: 2035: 2033: 2029: 2028: 2026: 2025: 2020: 2014: 2008: 2004: 2003: 2001: 2000: 1993: 1985: 1983: 1979: 1978: 1976: 1975: 1970: 1965: 1960: 1955: 1950: 1945: 1940: 1935: 1930: 1925: 1920: 1915: 1909: 1907: 1900:Catalan solids 1898: 1895: 1894: 1892: 1891: 1886: 1881: 1876: 1871: 1866: 1861: 1856: 1851: 1846: 1841: 1839:truncated cube 1836: 1831: 1825: 1823: 1806: 1803: 1802: 1800: 1799: 1794: 1789: 1784: 1779: 1773: 1771: 1758: 1757: 1751: 1749: 1748: 1741: 1734: 1726: 1717: 1716: 1714: 1713: 1711:parallelepiped 1708: 1703: 1698: 1693: 1688: 1683: 1677: 1675: 1668: 1667: 1665: 1664: 1658: 1652: 1645: 1643: 1639: 1638: 1636: 1635: 1629: 1623: 1617: 1614:Platonic solid 1610: 1608: 1604: 1603: 1601: 1600: 1599: 1598: 1592: 1586: 1574: 1569: 1564: 1558: 1556: 1552: 1551: 1549: 1548: 1542: 1536: 1530: 1524: 1518: 1512: 1506: 1499: 1497: 1493: 1492: 1490: 1489: 1484: 1479: 1477:Octadecahedron 1474: 1469: 1467:Hexadecahedron 1464: 1459: 1454: 1449: 1444: 1438: 1436: 1432: 1431: 1429: 1428: 1423: 1418: 1413: 1408: 1403: 1398: 1393: 1388: 1383: 1377: 1375: 1371: 1370: 1367: 1364: 1363: 1358: 1356: 1355: 1348: 1341: 1333: 1327: 1326: 1305: 1304:External links 1302: 1300: 1299: 1293: 1262: 1256: 1229: 1194: 1156: 1131:(1): 145–154, 1108: 1054: 1052: 1049: 1048: 1047: 1042: 1037: 1035:Dihedral group 1030: 1027: 974: 971: 948: 945: 942: 941: 938: 935: 932: 929: 926: 923: 920: 912: 911: 908: 905: 902: 899: 896: 893: 890: 884: 883: 877: 874: 868: 862: 856: 850: 844: 840: 839: 810: 807: 778: 749: 720: 691: 662: 654: 653: 650: 647: 644: 641: 638: 635: 632: 624: 623: 616: 613: 606: 599: 592: 585: 578: 572: 571: 564: 561: 554: 547: 540: 533: 526: 520: 519: 516: 514: 511: 449: 446: 400:angular defect 367: 364: 303:flat polyhedra 262:, made of two 250: 249: 237: 231: 230: 217: 214: 212:Rotation group 208: 207: 193: 190: 188:Symmetry group 184: 183: 154: 148: 147: 140: 134: 133: 126: 124:Wythoff symbol 120: 119: 110: 104: 103: 98: 92: 91: 86: 80: 79: 72: 66: 65: 55: 51: 50: 47: 39: 38: 37:-gonal dihedra 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2163: 2152: 2149: 2147: 2144: 2143: 2141: 2127: 2121: 2115: 2112: 2110: 2107: 2105: 2102: 2100: 2097: 2095: 2092: 2090: 2087: 2085: 2082: 2080: 2077: 2075: 2072: 2070: 2067: 2065: 2062: 2061: 2059: 2055: 2045: 2042: 2040: 2037: 2036: 2034: 2030: 2024: 2021: 2019: 2016: 2015: 2012: 2009: 2005: 1999: 1998: 1994: 1992: 1991: 1987: 1986: 1984: 1980: 1974: 1971: 1969: 1966: 1964: 1961: 1959: 1956: 1954: 1951: 1949: 1946: 1944: 1941: 1939: 1936: 1934: 1931: 1929: 1926: 1924: 1921: 1919: 1916: 1914: 1911: 1910: 1908: 1901: 1896: 1890: 1887: 1885: 1882: 1880: 1877: 1875: 1872: 1870: 1867: 1865: 1862: 1860: 1857: 1855: 1852: 1850: 1847: 1845: 1842: 1840: 1837: 1835: 1834:cuboctahedron 1832: 1830: 1827: 1826: 1824: 1819: 1815: 1809: 1804: 1798: 1795: 1793: 1790: 1788: 1785: 1783: 1780: 1778: 1775: 1774: 1772: 1768: 1763: 1759: 1755: 1747: 1742: 1740: 1735: 1733: 1728: 1727: 1724: 1712: 1709: 1707: 1704: 1702: 1699: 1697: 1694: 1692: 1689: 1687: 1684: 1682: 1679: 1678: 1676: 1673: 1669: 1662: 1659: 1656: 1653: 1650: 1647: 1646: 1644: 1640: 1633: 1632:Johnson solid 1630: 1627: 1626:Catalan solid 1624: 1621: 1618: 1615: 1612: 1611: 1609: 1605: 1596: 1593: 1590: 1587: 1584: 1581: 1580: 1578: 1575: 1573: 1570: 1568: 1565: 1563: 1560: 1559: 1557: 1553: 1546: 1543: 1540: 1537: 1534: 1531: 1528: 1525: 1522: 1521:Hexoctahedron 1519: 1516: 1513: 1510: 1507: 1504: 1501: 1500: 1498: 1494: 1488: 1485: 1483: 1480: 1478: 1475: 1473: 1470: 1468: 1465: 1463: 1460: 1458: 1455: 1453: 1452:Tridecahedron 1450: 1448: 1445: 1443: 1442:Hendecahedron 1440: 1439: 1437: 1433: 1427: 1424: 1422: 1419: 1417: 1414: 1412: 1409: 1407: 1404: 1402: 1399: 1397: 1394: 1392: 1389: 1387: 1384: 1382: 1379: 1378: 1376: 1372: 1365: 1361: 1354: 1349: 1347: 1342: 1340: 1335: 1334: 1331: 1322: 1321: 1316: 1313: 1308: 1307: 1303: 1296: 1294:0-521-81496-0 1290: 1286: 1282: 1278: 1277: 1272: 1266: 1263: 1259: 1257:0-486-61480-8 1253: 1249: 1245: 1244: 1239: 1233: 1230: 1226: 1222: 1217: 1212: 1208: 1204: 1198: 1195: 1191: 1187: 1182: 1177: 1173: 1169: 1163: 1161: 1157: 1146:on 2017-02-15 1142: 1138: 1134: 1130: 1126: 1119: 1112: 1109: 1104: 1100: 1096: 1092: 1088: 1084: 1079: 1078:gr-qc/0106033 1074: 1070: 1066: 1059: 1056: 1050: 1046: 1043: 1041: 1038: 1036: 1033: 1032: 1028: 1026: 1025:} in common. 1024: 1020: 1016: 1012: 1008: 1004: 1000: 996: 992: 988: 984: 980: 972: 970: 968: 962: 958: 954: 946: 939: 936: 933: 930: 927: 924: 921: 919: 914: 913: 909: 906: 903: 900: 897: 894: 891: 886: 885: 882: 878: 875: 873: 869: 867: 863: 861: 857: 855: 851: 849: 845: 842: 841: 811: 808: 779: 750: 721: 692: 663: 661: 656: 655: 651: 648: 645: 642: 639: 636: 633: 631: 626: 625: 621: 617: 614: 611: 607: 604: 600: 597: 593: 590: 586: 583: 579: 574: 573: 570: 565: 562: 560: 555: 553: 548: 546: 541: 539: 534: 532: 527: 522: 521: 517: 515: 509: 508: 505: 501: 495: 493: 488: 486: 482: 478: 473: 471: 467: 463: 459: 455: 447: 445: 443: 439: 435: 431: 427: 422: 420: 416: 412: 407: 401: 397: 392: 390: 385: 381: 377: 373: 365: 363: 361: 358: 354: 350: 346: 342: 337: 335: 331: 327: 323: 319: 315: 310: 308: 304: 300: 296: 292: 288: 284: 280: 276: 272: 269: 265: 261: 258:is a type of 257: 248: 244: 241: 238: 236: 232: 229: 225: 220: 215: 213: 209: 206: 202: 196: 191: 189: 185: 155: 153: 149: 145: 141: 139: 135: 131: 127: 125: 121: 118: 114: 111: 109: 105: 102: 99: 97: 93: 90: 87: 85: 81: 77: 73: 71: 67: 64: 60: 56: 52: 45: 40: 36: 31: 19: 2125: 2044:trapezohedra 1995: 1989: 1988: 1792:dodecahedron 1545:Apeirohedron 1496:>20 faces 1447:Dodecahedron 1385: 1318: 1275: 1265: 1242: 1232: 1206: 1197: 1171: 1148:, retrieved 1141:the original 1128: 1124: 1111: 1068: 1064: 1058: 1022: 1018: 1010: 1006: 1002: 994: 990: 986: 982: 978: 976: 956: 952: 950: 567:Apeirogonal 503: 499: 489: 485:great circle 480: 476: 474: 466:great circle 461: 453: 451: 441: 436:, each with 429: 425: 423: 408: 402:summing to 4 393: 379: 371: 369: 356: 348: 344: 338: 333: 330:great circle 321: 317: 311: 306: 302: 298: 294: 290: 267: 255: 253: 242: 227: 223: 218: 204: 200: 194: 143: 129: 116: 112: 100: 88: 75: 34: 1814:semiregular 1797:icosahedron 1777:tetrahedron 1487:Icosahedron 1435:11–20 faces 1421:Enneahedron 1411:Heptahedron 1401:Pentahedron 1396:Tetrahedron 557:Pentagonal 2140:Categories 2109:prismatoid 2039:bipyramids 2023:antiprisms 1997:hosohedron 1787:octahedron 1672:prismatoid 1657:(infinite) 1426:Decahedron 1416:Octahedron 1406:Hexahedron 1381:Monohedron 1374:1–10 faces 1315:"Dihedron" 1283:, p.  1150:2017-02-14 1051:References 1040:Polyhedron 977:A regular 887:Edges and 529:Monogonal 518:Euclidean 492:hosohedron 470:hemisphere 353:hosohedron 326:hemisphere 287:lens space 279:degenerate 260:polyhedron 247:hosohedron 226:), order 2 203:), order 4 59:polyhedron 2146:Polyhedra 2104:birotunda 2094:bifrustum 1859:snub cube 1754:polyhedra 1686:antiprism 1391:Trihedron 1360:Polyhedra 1320:MathWorld 1216:1007.2016 1181:1010.2450 889:vertices 628:Schläfli 543:Trigonal 513:Spherical 487:equator. 2084:bicupola 2064:pyramids 1990:dihedron 1386:Dihedron 1205:(2010), 1170:(2010), 1103:34259877 1045:Polytope 1029:See also 658:Coxeter 569:dihedron 559:dihedron 552:dihedron 545:dihedron 538:dihedron 536:Digonal 531:dihedron 372:dihedron 355:, where 332:. It is 318:dihedron 277:, it is 256:dihedron 199:, , (*22 96:Vertices 57:regular 2126:italics 2114:scutoid 2099:rotunda 2089:frustum 1818:uniform 1767:regular 1752:Convex 1706:pyramid 1691:frustum 1221:Bibcode 1186:Bibcode 1137:1990989 1083:Bibcode 973:Ditopes 918:config. 916:Vertex 660:diagram 575:Tiling 550:Square 523:Tiling 419:pyramid 384:polygon 382:-sided 351:-gonal 334:regular 299:bihedra 264:polygon 245:-gonal 240:regular 222:, , (22 18:Dihedra 2079:cupola 2032:duals: 2018:prisms 1696:cupola 1572:vertex 1291:  1254:  1135:  1101:  1015:ridges 999:facets 981:is an 979:ditope 843:Faces 652:{∞,2} 630:symbol 577:image 510:Space 343:of an 1701:wedge 1681:prism 1541:(132) 1211:arXiv 1176:arXiv 1144:(PDF) 1121:(PDF) 1099:S2CID 1073:arXiv 1021:,..., 1005:,..., 989:,..., 646:{5,2} 643:{4,2} 640:{3,2} 637:{2,2} 634:{1,2} 525:name 415:digon 413:with 411:prism 376:prism 360:digon 312:As a 305:, or 271:edges 84:Edges 78:-gons 70:Faces 1782:cube 1663:(57) 1634:(92) 1628:(13) 1622:(13) 1591:(16) 1567:edge 1562:face 1535:(90) 1529:(60) 1523:(48) 1517:(32) 1511:(30) 1505:(24) 1289:ISBN 1252:ISBN 940:∞.∞ 809:... 615:... 563:... 341:dual 339:The 316:, a 128:2 | 54:Type 1816:or 1651:(4) 1616:(5) 1585:(9) 1547:(∞) 1285:158 1091:doi 1017:, { 1001:, { 951:As 937:... 934:5.5 931:4.4 928:3.3 925:2.2 922:1.1 907:... 881:{∞} 876:... 872:{5} 866:{4} 860:{3} 854:{2} 848:{1} 649:... 444:}. 146:,2} 61:or 2142:: 1674:‌s 1317:. 1287:, 1250:, 1248:12 1219:, 1209:, 1184:, 1174:, 1159:^ 1133:MR 1129:44 1127:, 1123:, 1097:. 1089:. 1081:. 1069:18 1067:. 910:∞ 879:2 870:2 864:2 858:2 852:2 846:2 504:nn 475:A 472:. 452:A 424:A 370:A 309:. 301:, 289:L( 254:A 74:2 2128:. 1820:) 1812:( 1769:) 1765:( 1745:e 1738:t 1731:v 1352:e 1345:t 1338:v 1323:. 1223:: 1213:: 1188:: 1178:: 1154:. 1105:. 1093:: 1085:: 1075:: 1023:q 1019:p 1011:r 1009:, 1007:q 1003:p 995:r 993:, 991:q 987:p 983:n 957:n 953:n 904:5 901:4 898:3 895:2 892:1 500:n 481:n 462:n 442:n 440:{ 430:n 404:π 380:n 357:n 349:n 345:n 322:n 295:q 293:, 291:p 268:n 243:n 228:n 224:n 219:n 216:D 205:n 201:n 197:h 195:n 192:D 144:n 142:{ 132:2 130:n 117:n 115:. 113:n 101:n 89:n 76:n 35:n 20:)

Index

Dihedra

polyhedron
spherical tiling
Faces
Edges
Vertices
Vertex configuration
Wythoff symbol
Schläfli symbol
Coxeter diagram
Symmetry group
Rotation group
Dual polyhedron
regular
hosohedron
polyhedron
polygon
edges
Euclidean space
degenerate
spherical space
lens space
spherical tiling
hemisphere
great circle
dual
hosohedron
digon
prism

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