Asymptotic behaviour of Lie powers and Lie modules

Details Asymptotic behaviour of Lie powers and Lie modules Asymptotic behaviour of Lie powers and Lie modules

2010-09-06

arxiv.org/abs/1009.0974v2

Mathematics

Representation Theory

9 pages

Scientific paper

Let $V$ be a finite-dimensional $FG$-module, where $F$ is a field of prime characteristic $p$ and $G$ is a group. We show that, when $r$ is not a power of $p$, the Lie power $L^r(V)$ has a direct summand $B^r(V)$ which is a direct summand of the tensor power $V^{\otimes r}$ and which satisfies $\dim B^r(V)/\dim L^r(V) \to 1$ as $r \to \infty$. Similarly, for the same values of $r$, we obtain a projective submodule $C(r)$ of the Lie module $\Lie(r)$ over $F$ such that $\dim C(r)/\dim \Lie(r) \to 1$ as $r \to \infty$.

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