On conjugacy of unipotent elements in finite groups of Lie type

Details On conjugacy of unipotent elements in finite groups of Lie type On conjugacy of unipotent elements in finite groups of Lie type

2007-11-19

arxiv.org/abs/0711.2959v2

Mathematics

Group Theory

9 pages, Minor changes and corrections

Scientific paper

Let $\bfG$ be a connected reductive algebraic group defined over $\F_q$, where $q$ is a power of a prime $p$ that is good for $\bfG$. Let $F$ be the Frobenius morphism associated with the $\FF_q$-structure on $\bfG$ and set $G = \bfG^F$, the fixed point subgroup of $F$. Let $\bfP$ be an $F$-stable parabolic subgroup of $\bfG$ and let $\bfU$ be the unipotent radical of $\bfP$; set $P = \bfP^F$ and $U = \bfU^F$. Let $G_\uni$ be the set of unipotent elements in $G$. In this note we show that the number of conjugacy classes of $U$ in $G_\uni$ is given by a polynomial in $q$ with integer coefficients.

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