Abstract:Given lists of available colors assigned to the vertices of a graph G, a list coloring is a proper coloring of G such that the color on each vertex is chosen from its list. If the lists all have size k, then a list coloring is equitable if each color appears on at most dn(G )/ke vertices. A graph is equitably k-choosable if such a coloring exists whenever the lists all have size k. We prove that G is equitably k-choosable when k ! maxfÁ(G ),n(G )/ ------------------
Kostochka and West
“…A list analogue of equitable coloring was introduced by Kostochka, Pelsmajer and West [53]. A list assignment L for a graph G assigns to each vertex v ∈ V (G) a set L(v) of allowable colors.…”
Section: Equitable List Coloringmentioning
confidence: 99%
“…Nevertheless, Kostochka, Pelsmajer and West [53] suggested that the following analogue of the Hajnal-Szemerédi Theorem holds.…”
We discuss recent progress and unsolved problems concerning extremal graph packing, emphasizing connections between Dirac-type and Ore-type problems. Extra attention is paid to coloring, and especially equitable coloring, of graphs.
“…A list analogue of equitable coloring was introduced by Kostochka, Pelsmajer and West [53]. A list assignment L for a graph G assigns to each vertex v ∈ V (G) a set L(v) of allowable colors.…”
Section: Equitable List Coloringmentioning
confidence: 99%
“…Nevertheless, Kostochka, Pelsmajer and West [53] suggested that the following analogue of the Hajnal-Szemerédi Theorem holds.…”
We discuss recent progress and unsolved problems concerning extremal graph packing, emphasizing connections between Dirac-type and Ore-type problems. Extra attention is paid to coloring, and especially equitable coloring, of graphs.
“…In [17], a list analogue of equitable coloring was considered. A list assignment L for a graph G assigns to each vertex v ∈ V (G) a set L(v) of allowable colors.…”
Section: Equitable Partitions Of D-degenerate Graphsmentioning
Abstract. An equitable coloring of a graph is a proper vertex coloring such that the sizes of any two color classes differ by at most 1. A d-degenerate graph is a graph G in which every subgraph has a vertex with degree at most d. A star Sm with m rays is an example of a 1-degenerate graph with maximum degree m that needs at least 1 + m/2 colors for an equitable coloring. Our main result is that every n-vertex d-degenerate graph G with maximum degree at most n/15 can be equitably k-colored for each k ≥ 16d. The proof of this bound is constructive. We extend the algorithm implied in the proof to an O(d)-factor approximation algorithm for equitable coloring of an arbitrary d-degenerate graph. Among the implications of this result is an O(1)-factor approximation algorithm for equitable coloring of planar graphs with fewest colors. A variation of equitable coloring (equitable partitions) is also discussed.
“…Lih's paper [14] surveys some basic results on equitable colorings and how the bound of ∆ + 1 can be replaced by ∆ for certain classes of graphs. Applications of the Hajnal-Szemerédi theorem and recent results on equitable colorings of graphs can be found in (among others) [1], [2], [9], [11], [12], [19]. Equitable coloring turned out to be useful in establishing bounds on tails of sums of dependent variables [6], [8], [18].…”
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