Lie Elements and Knuth Relations

Details Lie Elements and Knuth Relations Lie Elements and Knuth Relations

2002-09-24

arxiv.org/abs/math/0209327v1

Canadian J. Math. 56 (2004), No. 4, 871-882

Mathematics

Rings and Algebras

15 pages

Scientific paper

A coplactic class in the symmetric group S_n consists of all permutations in S_n with a given Schensted Q-symbol, and may be described in terms of local relations introduced by Knuth. Any Lie element in the group algebra of S_n which is constant on coplactic classes is already constant on descent classes. As a consequence, the intersection of the Lie convolution algebra introduced by Patras and Reutenauer and the coplactic algebra introduced by Poirier and Reutenauer is the Solomon descent algebra.

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