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Majority choosability of 1-planar digraph

Weihao XiaJihui WangJiansheng Cai — 2023

Czechoslovak Mathematical Journal

A majority coloring of a digraph D with k colors is an assignment π : V ( D ) { 1 , 2 , , k } such that for every v V ( D ) we have π ( w ) = π ( v ) for at most half of all out-neighbors w N + ( v ) . A digraph D is majority k -choosable if for any assignment of lists of colors of size k to the vertices, there is a majority coloring of D from these lists. We prove that if U ( D ) is a 1-planar graph without a 4-cycle, then D is majority 3-choosable. And we also prove that every NIC-planar digraph is majority 3-choosable.

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