Discrete & Computational Geometry

, Volume 29, Issue 2, pp 223–227 | Cite as

A Euclidean Ramsey Problem

Abstract. Let C n denote the set of points in R n whose coordinates are all 0 or 1 , i.e., the vertex set of the unit n -cube. Graham and Rothschild [2] proved that there exists an integer N such that for n ≥ N , any 2-coloring of the edges of the complete graph on C n contains a monochromatic plane K 4 . Let N * be the minimum such N . They noted that N * must be at least 6 . Their upper bound on N * has come to be known as Graham's number , often cited as the largest number that has ever been put to any practical use. In this note we show that N * must be at least 11 and provide some experimental evidence suggesting that N * is larger still.


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Copyright information

© 2002 Springer-Verlag New York Inc.

Authors and Affiliations

  •  Exoo
    • 1
  1. 1.Department of Mathematics and Computer Science, Indiana State University, Terre Haute, IN 47809, USA g-exoo@indstate.eduUS

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