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Journal Article

FFLV-type monomial bases for type B

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Makhlin,  Igor
Max Planck Institute for Mathematics, Max Planck Society;

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https://doi.org/10.5802/alco.41
(Publisher version)

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Citation

Makhlin, I. (2019). FFLV-type monomial bases for type B. Algebraic Combinatorics, 2(2), 305-322. doi:10.5802/alco.41.


Cite as: https://hdl.handle.net/21.11116/0000-0004-6853-A
Abstract
We present a combinatorial monomial basis (or, more precisely, a family of monomial
bases) in every finite-dimensional irreducible $\mathfrak{so}_{2n+1}$ -module. These bases are in many ways similar to the FFLV bases for types $A$ and $C$. They are also defined combinatorially via sums over Dyck paths in certain triangular grids. Our sums, however, involve weights depending on the length of the corresponding root. Accordingly, our bases also induce bases in certain degenerations of the modules but these degenerations are obtained not from the filtration by PBW degree but by a weighted version thereof.