In 1980, Burr conjectured that every directed graph with chromatic number
Seminars and Colloquiums
Calendar of Events
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We prove the following variant of Helly’s classical theorem for Hamming balls with a bounded radius. For |
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We say that a 0-1 matrix A contains another such matrix (pattern) P if P can be obtained from a submatrix of A by possibly changing a few 1 entries to 0. The main question of this theory is to estimate the maximal number of 1 entries in an n by n 0-1 matrix NOT … |
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