Number of cyclically irreducible words in the alphabet of a free group of finite rank |
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Authors: | L M Koganov |
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Affiliation: | (1) Scientific Center of Nonlinear Wave Mechanics and Technology, Russian Academy of Science, Moscow, Russia |
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Abstract: | It is shown that a formula that was independently obtained earlier for the number of cyclically irreducible words of length
n in a symmetric alphabet of a finitely generated free group of rank k and the Whitney formula for a chromatic polynomial
of a simple nonself-intersecting cycle of length n with a variable λ are mutually deducible from one another when λ = 2k.
The necessary bijections differ for even and odd values of n.
To the memory of William T. Tutte (05.14.1917–05.02.2002)
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Translated from Kibernetika i Sistemnyi Analiz, No. 4, pp. 39–48, July–August 2007. |
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Keywords: | cyclically irreducible word proper word chromatic polynomial of a graph Whitney formula for the chromatic polynomial of a simple cycle |
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