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Proper connection and proper-walk connection of digraphs
Applied Mathematics and Computation ( IF 4 ) Pub Date : 2021-04-27 , DOI: 10.1016/j.amc.2021.126253
Anna Fiedorowicz , Elżbieta Sidorowicz , Éric Sopena

An arc-colored digraph D is properly (properly-walk) connected if, for any ordered pair of vertices (u,v), the digraph D contains a directed path (a directed walk) from u to v such that arcs adjacent on that path (on that walk) have distinct colors. The proper connection number pc(D) (the proper-walk connection number wc(D)) of a digraph D is the minimum number of colours to make D properly connected (properly-walk connected). We prove that pc(Cn(S))2 for every circulant digraph Cn(S) with S{1,,n1},|S|2 and 1S. Furthermore, we give some sufficient conditions for a Hamiltonian digraph D to satisfy pc(D)=wc(D)=2.



中文翻译:

有向图的正确连接和正确的行走连接

圆弧形的有向图 d 对于任何有序的顶点对,是否正确连接(正确行走) üvd 包含来自的定向路径(定向步行) üv这样,在该路径上(在该行人道上)相邻的弧线会具有不同的颜色。正确的连接号pCd (正确的步行连接号 wCd图) d 是要制作的最小颜色数 d正确连接(正确步行连接)。我们证明pCCñ小号2个 对于每个循环图 Cñ小号小号{1个ñ-1个}|小号|2个1个小号。此外,我们给出了哈密顿图的一些充分条件d 为了满足 pCd=wCd=2个

更新日期:2021-04-28
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