Displaying similar documents to “Words with intervening neighbours in infinite Coxeter groups are reduced.”

Note: The Smallest Nonevasive Graph Property

Michał Adamaszek (2014)

Discussiones Mathematicae Graph Theory

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A property of n-vertex graphs is called evasive if every algorithm testing this property by asking questions of the form “is there an edge between vertices u and v” requires, in the worst case, to ask about all pairs of vertices. Most “natural” graph properties are either evasive or conjectured to be such, and of the few examples of nontrivial nonevasive properties scattered in the literature the smallest one has n = 6. We exhibit a nontrivial, nonevasive property of 5-vertex graphs...

On Christoffel classes

Jean-Pierre Borel, Christophe Reutenauer (2006)

RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications

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We characterize conjugation classes of Christoffel words (equivalently of standard words) by the number of factors. We give several geometric proofs of classical results on these words and sturmian words.

On-line Ramsey theory.

Grytczuk, J.A., Hałuszczak, M., Kierstead, H.A. (2004)

The Electronic Journal of Combinatorics [electronic only]

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R ( 3 , 4 ) = 17 .

Pralat, Pawel (2008)

The Electronic Journal of Combinatorics [electronic only]

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