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11-cell

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29: 60: 278: 300:, and contains 1/3 of its 165 faces. Thus it can be drawn as a regular figure in 10-space, although then its hemi-icosahedral cells are skew; that is, each cell is not contained within a flat 3-dimensional 175: 326:- regular hyperbolic honeycomb with same Schläfli type, {3,5,3}. (The 11-cell can be considered to be derived from it by identification of appropriate elements.) 249:
It has symmetry order 660, computed as the product of the number of cells (11) and the symmetry of each cell (60). The symmetry structure is the abstract group
34:
The 11 hemi-icosahedra with vertices labeled by indices 0..9,t. Faces are colored by the cell it connects to, defined by the small colored boxes.
264:, who constructed it by pasting hemi-icosahedra together, three at each edge, until the shape closed up. It was independently discovered by 349: 250: 189: 413: 389: 110: 377: 282: 323: 228: 382: 301: 203: 261: 243: 103: 345: 231: 96: 43: 396: 265: 239: 54: 28: 181: 407: 91: 337: 220: 59: 390:
Isama 2007, Texas A&m hyper-Seeing the Regular Hendeca-choron. (= 11-Cell)
297: 286: 235: 365:
The Classification of Rank 4 Locally Projective Polytopes and Their Quotients
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of the 2-dimensional vector space over the finite field with 11 elements L
246:{3,5,3}, with 3 hemi-icosahedra (Schläfli type {3,5}) around each edge. 354: 318: 364: 296:
contains the same number of vertices and edges as the 10-dimensional
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in 1984, who studied its structure and symmetry in greater depth.
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J. Lanier, Jaron’s World. Discover, April 2007, pp 28-29.
113: 242:. It has 11 vertices, 55 edges and 55 faces. It has 359:
A Symmetrical Arrangement of Eleven hemi-Icosahedra
169: 361:, Annals of Discrete Mathematics 20 pp103–114. 8: 164: 155: 142: 130: 117: 114: 388:, Carlo H. SĂ©quin & Jaron Lanier, Also 170:{\displaystyle \{\{3,5\}_{5},\{5,3\}_{5}\}} 21: 397:"Explanations GrĂĽnbaum-Coxeter Polytopes" 158: 133: 112: 386:Hyperseeing the Regular Hendecachoron 7: 344:, Cambridge University Press, 2002. 14: 276: 58: 27: 251:projective special linear group 209: 199: 180: 102: 90: 82: 74: 66: 49: 39: 1: 260:It was discovered in 1977 by 289:with 11 vertices, 55 edges. 232:abstract regular 4-polytope 44:Abstract regular 4-polytope 16:Abstract regular 4-polytope 430: 342:Abstract Regular Polytopes 367:, 2003, Michael I Hartley 236:four-dimensional polytope 283:Orthographic projection 171: 324:Icosahedral honeycomb 172: 238:). Its 11 cells are 111: 414:Regular 4-polytopes 395:Klitzing, Richard. 384:2007 ISAMA paper: 167: 272:Related polytopes 217: 216: 97:hemi-dodecahedron 421: 400: 336:Peter McMullen, 280: 266:H. S. M. Coxeter 240:hemi-icosahedral 176: 174: 173: 168: 163: 162: 138: 137: 62: 55:hemi-icosahedron 31: 19: 429: 428: 424: 423: 422: 420: 419: 418: 404: 403: 394: 374: 355:Coxeter, H.S.M. 333: 310: 281: 274: 262:Branko GrĂĽnbaum 256: 193: 187: 154: 129: 109: 108: 104:Schläfli symbol 57: 32: 17: 12: 11: 5: 427: 425: 417: 416: 406: 405: 402: 401: 392: 380: 373: 372:External links 370: 369: 368: 362: 352: 332: 329: 328: 327: 321: 316: 309: 306: 273: 270: 254: 215: 214: 211: 207: 206: 201: 197: 196: 191: 184: 182:Symmetry group 178: 177: 166: 161: 157: 153: 150: 147: 144: 141: 136: 132: 128: 125: 122: 119: 116: 106: 100: 99: 94: 88: 87: 84: 80: 79: 76: 72: 71: 68: 64: 63: 51: 47: 46: 41: 37: 36: 24: 23: 15: 13: 10: 9: 6: 4: 3: 2: 426: 415: 412: 411: 409: 398: 393: 391: 387: 383: 381: 379: 376: 375: 371: 366: 363: 360: 356: 353: 351: 350:0-521-81496-0 347: 343: 339: 335: 334: 330: 325: 322: 320: 317: 315: 312: 311: 307: 305: 303: 299: 295: 292:The abstract 290: 288: 284: 279: 271: 269: 267: 263: 258: 252: 247: 245: 244:Schläfli type 241: 237: 233: 230: 226: 222: 212: 208: 205: 202: 198: 195: 185: 183: 179: 159: 151: 148: 145: 139: 134: 126: 123: 120: 107: 105: 101: 98: 95: 93: 92:Vertex figure 89: 85: 81: 77: 73: 69: 65: 61: 56: 52: 48: 45: 42: 38: 35: 30: 25: 20: 385: 358: 341: 338:Egon Schulte 293: 291: 275: 259: 248: 224: 218: 33: 221:mathematics 331:References 298:10-simplex 287:10-simplex 210:Properties 314:5-simplex 229:self-dual 204:self-dual 188:Abstract 186:order 660 408:Category 308:See also 302:subspace 213:Regular 83:Vertices 22:11-cell 319:57-cell 294:11-cell 225:11-cell 70:55 {3} 348:  257:(11). 223:, the 227:is a 75:Edges 67:Faces 50:Cells 346:ISBN 200:Dual 194:(11) 40:Type 285:of 219:In 86:11 78:55 53:11 410:: 357:, 340:, 304:. 399:. 255:2 234:( 192:2 190:L 165:} 160:5 156:} 152:3 149:, 146:5 143:{ 140:, 135:5 131:} 127:5 124:, 121:3 118:{ 115:{

Index


Abstract regular 4-polytope
hemi-icosahedron

Vertex figure
hemi-dodecahedron
Schläfli symbol
Symmetry group
L2(11)
self-dual
mathematics
self-dual
abstract regular 4-polytope
four-dimensional polytope
hemi-icosahedral
Schläfli type
projective special linear group
Branko GrĂĽnbaum
H. S. M. Coxeter

Orthographic projection
10-simplex
10-simplex
subspace
5-simplex
57-cell
Icosahedral honeycomb
Egon Schulte
ISBN
0-521-81496-0

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