Frobenius P-categories via the Alperin condition

Details Frobenius P-categories via the Alperin condition Frobenius P-categories via the Alperin condition

2010-04-09

arxiv.org/abs/1004.1620v1

Mathematics

Group Theory

Scientific paper

In "Frobenius Categories versus Brauer Blocks", Progress in Math. 274, we introduce the Frobenius P-categories giving two quite different definitions of them. In this paper, we exhibit a third equivalent definition based on the form of the old Alperin Fusion Theorem; this theorem can be reformulated in our abstract setting, and ultimately depends on the behavior of the so-called F-essential subgroups of P: we call "Alperin condition" a sufficient form of this behavior. Then, we prove that a divisible P-category F is a Frobenius P-category if and only if all the partial normalizers of a suitable set of representatives for the F-isomorphism classes of subgroups of P fulfill both the Sylow and the Alperin conditions.

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