Supercharacters and pattern subgroups in the upper triangular groups

Details Supercharacters and pattern subgroups in the upper triangular groups Supercharacters and pattern subgroups in the upper triangular groups

2010-08-13

arxiv.org/abs/1008.2269v1

Mathematics

Representation Theory

12 pages

Scientific paper

Let $U_n(q)$ denote the upper triangular group of degree $n$ over the finite field $\F_q$ with $q$ elements. It is known that irreducible constituents of supercharacters partition the set of all irreducible characters $Irr(U_n(q)).$ In this paper we present a correspondence between supercharacters and pattern subgroups of the form $U_k(q)\cap {}^wU_k(q)$ where $w$ is a monomial matrix in $GL_k(q)$ for some $k

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