r)-coloring of G is a proper coloring c such that for any vertex v
v is adjacent to vertices of at least min{d(v)
r} different colors with c(v) ∈ L(v). The r-hued list chromatic number of G
denoted as χL
r(G)
is the least integer k
such that for any v ∈ V(G)
and every list assignment L with |L(v)| = k
G has an(L
r)-coloring. In this paper
we prove that χL
2(Pm□Pn) = 4
and determine the range of χL
2(Pm□Cn).
关键词
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references
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