JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) ›› 2023, Vol. 58 ›› Issue (8): 63-72.doi: 10.6040/j.issn.1671-9352.0.2021.513

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L(2, 1)- edge coloring algorithm for several kinds of composite graphs

Lina ZHU(),Jingwen LI*(),Shuai SUN   

  1. School of Electronic and Information Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China
  • Received:2021-08-17 Online:2023-08-20 Published:2023-07-28
  • Contact: Jingwen LI E-mail:3072039233@qq.com;lijingwen28@163.com

Abstract:

An L(2, 1)- edge coloring algorithm is designed to solve the L(2, 1)- edge coloring for random graphs. By analyzing the experimental results, the coloring properties of five classes of join graphs are found, and FnSmCnCmFn(2)C3(n)Sm and Cn(m) are used to describe these graphs. The related theorems and proofs are given as well.

Key words: L(2, 1)- edge coloring, chromatic number, composite graphs, algorithm

CLC Number: 

  • O157.5

Fig.1

Example of G↑H"

Fig.2

Example of Cn(m)"

Table 1

L(2, 1)-edge coloring number of graphs within 11 points"

染色跨度 点数
3 4 5 6 7 8 9 10
Δ+1 0 2 3 2 2 2 5 4
Δ+2 1 2 7 17 32 63 122 290
Δ+3 0 1 7 30 98 289 872 2 740
Δ+4 0 1 2 28 146 649 2 916 12 664
Δ+5 0 0 2 15 136 1 037 6 431 39 338
Δ+6 0 0 0 9 140 1 350 12 252 99 986
Δ+7 0 0 0 6 111 1 553 18 727 207 699
Δ+8 0 0 0 3 90 1 659 25 206 368 272
Δ+9 0 0 0 1 51 1 456 29 834 578 938
Δ+10 0 0 0 1 30 1 106 32 771 824 978
Δ+11 0 0 0 0 7 797 31 555 1 059 707
Δ+12 0 0 0 0 6 506 28 313 1 218 095
Δ+13 0 0 0 0 2 327 22 872 1 278 529
Δ+14 0 0 0 0 0 156 17 606 1 244 017
Δ+15 0 0 0 0 1 83 12 084 1 146 528
Δ+16 0 0 0 0 12 48 8 128 997 517
Δ+17 0 0 0 0 0 18 5 090 830 287
Δ+18 0 0 0 0 0 9 3 037 687 759
Δ+19 0 0 0 0 0 5 1 709 570 315
Δ+20 0 0 0 0 0 2 915 426 317
Δ+21 0 0 0 0 0 1 375 259 821
Δ+22 0 0 0 0 0 15 154 149 071
Δ+23 0 0 0 0 0 0 65 95 342
Δ+24 0 0 0 0 0 0 24 55 577
Δ+25 0 0 0 0 0 0 8 28 543
Δ+26 0 0 0 0 0 0 5 15 130
Δ+27 0 0 0 0 0 0 2 5 514
Δ+28 0 0 0 0 0 0 1 1 416
Δ+29 0 0 0 0 0 0 1 515
Δ+30 0 0 0 0 0 0 0 179
Δ+31 0 0 0 0 0 0 0 75
Δ+32 0 0 0 0 0 0 0 27
Δ+33 0 0 0 0 0 0 0 9
Δ+34 0 0 0 0 0 0 0 5
Δ+35 0 0 0 0 0 0 0 2
Δ+36 0 0 0 0 0 0 0 1
Δ+37 0 0 0 0 0 0 0 1
图总数 1 6 21 112 853 11 117 261 080 12 205 208

Fig.3

Examples of edge coloring of Fn↑Sm"

Fig.4

Examples of edge coloring of Cn↑Cm"

Fig.5

Examples of edge coloring of Fn(2)"

Fig.6

Examples of edge coloring of C3(4)↑S5"

Fig.7

Examples of edge coloring of Cn(m)(3≤n≤6)"

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