Knowledge

Path graph

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Paths are fundamental concepts of graph theory, described in the introductory sections of most graph theory texts. See, for example, Bondy and Murty (1976), Gibbons (1985), or Diestel (2005).
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This article is about a family of graphs. For paths as parts of arbitrary graphs, see
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in that graph. A path is a particularly simple example of a
42: 528: 201:{\displaystyle \{2\cos \left({\frac {k\pi }{n+1}}\right);} 373:. Equivalently, a path with at least two vertices is 213: 151: 592: 240: 200: 560: 613: 388:of other graphs, in which case they are called 381:1), while all others (if any) have degree 2. 235: 152: 571:, vol. 173, Springer-Verlag. pp. 6–9. 384:Paths are often important in their role as 377:and has two terminal vertices (vertices of 499:vertices, some authors (e.g. Diestel) use 423:of type A. As such, they classify the 614: 593: 410: 16:Graph with nodes connected linearly 13: 14: 638: 586: 41: 488:While it is most common to use 241:{\displaystyle k=1,\ldots ,n\}} 539:Graph Theory with Applications 482: 284:Table of graphs and parameters 1: 627:Parametric families of graphs 569:Graduate Texts in Mathematics 475: 419:, path graphs appear as the 7: 438: 315:can be listed in the order 10: 643: 561:Diestel, Reinhard (2005). 542:. North Holland. pp.  47:A path graph on 6 vertices 25: 18: 282: 269: 251: 140: 130: 120: 110: 95: 79: 64: 52: 40: 35: 431:of type A, which is the 26:Not to be confused with 242: 202: 400:of paths is called a 243: 203: 622:Trees (graph theory) 470:Cycle (graph theory) 211: 149: 445:Path (graph theory) 21:Path (graph theory) 595:Weisstein, Eric W. 465:Path decomposition 427:of type A and the 411:As Dynkin diagrams 238: 198: 289: 288: 189: 634: 608: 607: 582: 567:(3rd ed.). 557: 521: 519: 509: 505: 498: 494: 486: 450:Caterpillar tree 372: 361: 337: 278: 247: 245: 244: 239: 207: 205: 204: 199: 194: 190: 188: 177: 169: 122:Chromatic number 106: 91: 75: 60: 45: 33: 32: 642: 641: 637: 636: 635: 633: 632: 631: 612: 611: 589: 579: 554: 534:Murty, U. S. R. 525: 524: 514: 507: 504: 500: 496: 493: 489: 487: 483: 478: 441: 433:symmetric group 421:Dynkin diagrams 413: 363: 360: 349: 343: 335: 329: 322: 316: 277: 273: 262: 260:Bipartite graph 258: 212: 209: 208: 178: 170: 168: 164: 150: 147: 146: 132:Chromatic index 101: 85: 70: 58: 48: 31: 24: 17: 12: 11: 5: 640: 630: 629: 624: 610: 609: 588: 587:External links 585: 584: 583: 577: 558: 552: 523: 522: 506:for a path of 502: 495:for a path of 491: 480: 479: 477: 474: 473: 472: 467: 462: 457: 455:Complete graph 452: 447: 440: 437: 412: 409: 398:disjoint union 355: 347: 338:such that the 333: 327: 320: 287: 286: 280: 279: 275: 271: 267: 266: 253: 249: 248: 237: 234: 231: 228: 225: 222: 219: 216: 197: 193: 187: 184: 181: 176: 173: 167: 163: 160: 157: 154: 144: 138: 137: 134: 128: 127: 124: 118: 117: 114: 108: 107: 99: 93: 92: 83: 77: 76: 68: 62: 61: 56: 50: 49: 46: 38: 37: 15: 9: 6: 4: 3: 2: 639: 628: 625: 623: 620: 619: 617: 605: 604: 599: 596: 591: 590: 580: 578:3-540-26182-6 574: 570: 566: 565: 559: 555: 553:0-444-19451-7 549: 545: 541: 540: 535: 531: 527: 526: 517: 512: 485: 481: 471: 468: 466: 463: 461: 458: 456: 453: 451: 448: 446: 443: 442: 436: 434: 430: 426: 422: 418: 408: 405: 403: 402:linear forest 399: 395: 391: 387: 382: 380: 376: 370: 367:= 1, 2, ..., 366: 358: 354: 350: 341: 336: 326: 319: 314: 310: 306: 302: 298: 294: 285: 281: 272: 268: 265: 261: 257: 256:Unit distance 254: 250: 232: 229: 226: 223: 220: 217: 214: 195: 191: 185: 182: 179: 174: 171: 165: 161: 158: 155: 145: 143: 139: 135: 133: 129: 125: 123: 119: 115: 113: 112:Automorphisms 109: 104: 100: 98: 94: 89: 84: 82: 78: 73: 69: 67: 63: 57: 55: 51: 44: 39: 34: 29: 22: 601: 598:"Path Graph" 564:Graph Theory 563: 538: 530:Bondy, J. A. 515: 510: 484: 414: 406: 383: 368: 364: 356: 352: 345: 331: 324: 317: 305:linear graph 304: 300: 297:graph theory 293:mathematical 290: 102: 87: 71: 425:root system 616:Categories 476:References 460:Null graph 429:Weyl group 301:path graph 252:Properties 36:Path graph 28:line graph 603:MathWorld 520:vertices. 386:subgraphs 375:connected 295:field of 227:… 175:π 162:⁡ 536:(1976). 439:See also 362:} where 313:vertices 270:Notation 142:Spectrum 97:Diameter 54:Vertices 417:algebra 330:, ..., 307:) is a 291:In the 575:  550:  379:degree 311:whose 81:Radius 544:12–21 511:edges 390:paths 340:edges 309:graph 66:Edges 573:ISBN 548:ISBN 513:and 394:tree 342:are 303:(or 299:, a 264:Tree 415:In 371:− 1 159:cos 105:− 1 90:/2⌋ 74:− 1 618:: 600:. 546:. 532:; 518:+1 435:. 404:. 359:+1 351:, 323:, 606:. 581:. 556:. 516:n 508:n 503:n 501:P 497:n 492:n 490:P 369:n 365:i 357:i 353:v 348:i 346:v 344:{ 334:n 332:v 328:2 325:v 321:1 318:v 276:n 274:P 236:} 233:n 230:, 224:, 221:1 218:= 215:k 196:; 192:) 186:1 183:+ 180:n 172:k 166:( 156:2 153:{ 136:2 126:2 116:2 103:n 88:n 86:⌊ 72:n 59:n 30:. 23:.

Index

Path (graph theory)
line graph

Vertices
Edges
Radius
Diameter
Automorphisms
Chromatic number
Chromatic index
Spectrum
Unit distance
Bipartite graph
Tree
Table of graphs and parameters
mathematical
graph theory
graph
vertices
edges
connected
degree
subgraphs
paths
tree
disjoint union
linear forest
algebra
Dynkin diagrams
root system

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