Combinatorial Relations and Chromatic Graphs
Combinatorial Relations and Chromatic Graphs
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DOI:
10.4153/cjm-1955-001-4
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发表时间:
1955
期刊:
影响因子:
--
通讯作者:
R. Greenwood;A. Gleason
中科院分区:
文献类型:
--
作者:
R. Greenwood;A. Gleason
1. Introduction. The following elementary logical problem was a question in the William Lowell Putnam Mathematical Competition held in March 1953 (1): Six points are in general position in space (no three in a line, no four in a plane). The fifteen line segments joining them in pairs are drawn, and then painted, some segments red, some blue. Prove that some triangle has all its sides the same color.