1955/01/01 by Robert E. Greenwood, Andrew M. Gleason · 3 citations
Mathematics · #Mathematics and Applications
paper · pdf · doi:10.4153/cjm-1955-001-4
openalex publication_date 1955/01/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04
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.