Counting up to four

Ivar Ekeland ()
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Ivar Ekeland: the University of Paris-Dauphine

Nature, 1999, vol. 397, issue 6718, 393-394

Abstract: When mathematicians play with marbles they make advances in number theory and arithmetic progressions. A new proof calculates the maximum number of marbles that can be placed in a line without any four of them being evenly spaced, and raises hopes that a long-standing problem in number theory might finally be solved.

Date: 1999
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DOI: 10.1038/17026

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