Sign sequences and decomposition numbers

Details Sign sequences and decomposition numbers Sign sequences and decomposition numbers

2011-05-23

arxiv.org/abs/1105.4405v2

Mathematics

Representation Theory

Scientific paper

We obtain a closed formula for the $v$-decomposition numbers $d_{\lambda\mu}(v)$ arising from the canonical basis of the Fock space representation of $U_v(\hat{\mathfrak{sl}}_e)$, where the partition $\lambda$ is obtained from $\mu$ by moving some nodes in its Young diagram, all of which having the same $e$-residue. We also show that when these $v$-decomposition numbers are evaluated at $v=1$, we obtain the corresponding decomposition numbers for the Schur algebras and symmetric groups.

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