A noncommutative geometric LR rule - Archive ouverte HAL
Conference Papers Discrete Mathematics and Theoretical Computer Science Year : 2020

A noncommutative geometric LR rule

Abstract

The geometric Littlewood-Richardson (LR) rule is a combinatorial algorithm for computing LR coefficients derived from degenerating the Richardson variety into a union of Schubert varieties in the Grassmannian. Such rules were first given by Vakil and later generalized by Coskun. In this paper we give a noncommutative version of the geometric LR rule. As a consequence, we establish a geometric explanation for the positivity of noncommutative LR coefficients in certain cases.

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Dates and versions

hal-02166336 , version 1 (26-06-2019)

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Edward Richmond, Vasu Tewari, Stephanie van Willigenburg. A noncommutative geometric LR rule. 28-th International Conference on Formal Power Series and Algebraic Combinatorics, Simon Fraser University, Jul 2016, Vancouver, Canada. ⟨10.46298/dmtcs.6367⟩. ⟨hal-02166336⟩
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