A lift of Schur's Q-functions to the peak algebra
arXiv:1408.6045 · doi:10.1016/j.jcta.2015.05.006
Abstract
We construct a lift of Schur's Q-functions to the peak algebra of the symmetric group, called the noncommutative Schur Q-functions, and extract from them a new natural basis with several nice properties such as the positive right-Pieri rule, combinatorial expansion, etc. Dually, we get a basis of the Stembridge algebra of peak functions refining Schur's P-functions in a simple way.
22 pages, 20refs
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