新疆大学数学与系统科学学院
纸质出版:2023
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[1]郭春强,吴宝音都仍.1-平面图的奇着色数最多是21(英文)[J].新疆大学学报(自然科学版)(中英文),2023,40(03):267-273.
[1]郭春强,吴宝音都仍.1-平面图的奇着色数最多是21(英文)[J].新疆大学学报(自然科学版)(中英文),2023,40(03):267-273. DOI: 10.13568/j.cnki.651094.651316.2022.07.01.0001.
DOI:10.13568/j.cnki.651094.651316.2022.07.01.0001.
对于任何一个图G的正常点着色φ而言
如果对于任何一个非孤立点x
存在一个颜色c使得|φ-1(c)∩NG(x)|是奇的
则φ被称为图G的奇着色.如果一个图能画在一个平面上
使得每一边至多被另一条边相交
则这样的图被称为1-平面图.证明了任何一个1-平面图是奇21-着色的
改进了最近由Cranston
Lafferty和Song得到的界23.
A proper vertex coloring φ of a graph G is said to be odd if for each non-isolated vertex x∈V(G) there exists a color c such that |φ-1(c)∩NG(x)| is odd. A graph is 1-planar if it can be drawn in the plane so that each edge is crossed by at most one other edge. We prove every 1-planar graph admits an odd 21-coloring. This improves a recently obtained bound
23
due to Cranston
Lafferty and Song.
BONDY J A, MURTY U S R. Graph theory[M]. New York:Springer, 2008.
PETRUˇSEVSKI M,ˇSKREKOVSKI R. Colorings with neighborhood parity condition[J]. Discrete Applied Mathematics, 2022, 321:385-391.
CARO Y, PETRUˇSEVSKI M,ˇSKREKOVSKI R. Remarks on odd colorings of graphs[J]. Discrete Applied Mathematics, 2022, 321:392-401.
PETR J, PORTIER J. The odd chromatic number of a planar graphs is at most 8[J]. Graphs and Combinatorics, 2023, 39(2):1-8.
CHO E K, CHOI I, KWON H, et al. Odd coloring of sparse graphs and planar graphs[J]. Discrete Mathematics, 2023, 346(5):113305.
CRANSTON D W, LAFFERTY M, SONG Z X. A note on odd colorings of 1-planar graphs[J]. Discrete Applied Mathematics, 2023, 330:112-117.
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