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Block theory and Brauer's first main theorem for profinite groups

Authors :
Flores, Ricardo J. Franquiz
MacQuarrie, John W.
Publication Year :
2021

Abstract

We develop the local-global theory of blocks for profinite groups. Given a field $k$ of characteristic $p$ and a profinite group $G$, one may express the completed group algebra $k[[G]]$ as a product $\prod_{i\in I}B_i$ of closed indecomposable algebras, called the blocks of $G$. To each block $B$ of $G$ we associate a pro-$p$ subgroup of $G$, called the defect group of $B$, unique up to conjugacy in $G$. We give several characterizations of the defect group in analogy with defect groups of blocks of finite groups. Our main theorem is a Brauer correspondence between the blocks of $G$ with defect group $D$ and the blocks of the normalizer $N_G(D)$ with defect group $D$.<br />Comment: 25 pages. Final version, to be published in Advances in Mathematics

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.2105.10964
Document Type :
Working Paper