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Some combinatorial Lemmas in topology

Published: 01 November 1960 Publication History

Abstract

For many years it has been known that a combinatorial result, called the Sperner Lemma, provides an elegant proof of the Brouwer Fixed Point Theorem. Although the proof is elementary, its complete formal exposition depends upon the somewhat complicated operation of subdividing a simplex. Also, the proof does not show whether the Sperner Lemma can be derived from the Brouwer Fixed Point Theorem.
This central result of this paper is a combinatorial proposition, analogous to the Sperner Lemma, and applying to the n-cube, for which subdivision is a trivial operation. This Cubical Sperner Lemma follows immediately from the Brouwer Fixed Point Theorem and thus opens the possibility of other applications of topology to combinatorial problems. The question of such a topological proof is raised for another cubical analogue of the Sperner Lemma, due to Ky Fan, and for the Tucker Lemma, which is related to the antipodal point theorems. The Cubical Sperner Lemma of this paper implies the Tucker Lemma in 2-dimensions; this suggests that other connections joining these combinatorial results remain to be discovered.

References

[1]
B. Knaster, K. Kuratowski, and S. Maeurkiewice, Fundamental Math. 14, 132 (1929).
[2]
E. Sperner, Abh. math. Sem. Hamburg, 6, 265 (1928).
[3]
The simplical decomposition of the cube described in the lemma has been used previously by A. W. Tucker. It appears as Problem 3, p. 140, of Introductions to Topology by S. Lefschete, Princeton University Press, 1949.
[4]
S. Kakutani, Duke Math. J. 8, 457 (1941).
[5]
A. W. Tucker, Proceedings, Canadian Math. Congress, p. 285 (Montreal 1945).
[6]
S. Lefschetz, Princeton University Press, 1949.

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Published In

cover image IBM Journal of Research and Development
IBM Journal of Research and Development  Volume 4, Issue 5
November 1960
105 pages

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IBM Corp.

United States

Publication History

Published: 01 November 1960
Received: 22 July 1960

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