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Combinatorial Relations and Chromatic Graphs
R. E. Greenwood, A. M. Gleason
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Source: Crossref
Published: Jan 1, 1955
DOI: 10.4153/cjm-1955-001-4
Open original source ↗Source abstract
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.
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