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Canonical bases and new applications of increasing and decreasing subsequences to invariant theory

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arxiv 2206.12001 v4 pith:HVI3R25Q submitted 2022-06-23 math.RT math.CO

C. Bowman , S. Doty , S. Martin This is my paper · ORCID
classification math.RTmath.CO
keywords algebrabasiscentraliseractingbasescanonicalentriesinvariant
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In 2012 Raghavan, Samuel, and Subrahmanyam showed that the Kazhdan--Lusztig basis for the Iwahori--Hecke algebra in type A provides a ``canonical'' basis for the centraliser algebra of the Schur algebra acting on tensor space. In 2022 the second author found a similar result for the centraliser of the partition algebra acting on the same tensor space. Each basis is indexed by permutations. We exploit these bases to show that the linear decomposition of an arbitrary invariant (in either centraliser algebra) depends integrally on its entries, and describe combinatorial rules that pick out minimal sets of such entries.

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  1. Rook sums in the symmetric group algebra

    math.CO 2025-07 conditional novelty 6.0 of 10

    Rook sums in the symmetric group algebra satisfy an explicit product rule, have linearly factorable minimal polynomials, and generate ideals whose sizes count pattern-avoiding permutations.

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