On Beck's coloring of posets
On Beck's coloring of posets
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DOI:
10.1016/j.disc.2009.02.024
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发表时间:
2009-07
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影响因子:
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通讯作者:
R. Halaš;M. Jukl
中科院分区:
文献类型:
--
作者:
R. Halaš;M. Jukl
We study Beck-like coloring of partially ordered sets (posets) with a least element 0. To any poset P with 0 we assign a graph (called a zero-divisor graph) whose vertices are labelled by the elements of P with two vertices x,y adjacent if 0 is the only element lying below x and y. We prove that for such graphs, the chromatic number and the clique number coincide. Also, we give a condition under which posets are not finitely colorable.