Blocks of Finite Groups The Hyperfocal Subalgebra of a Block / by Lluis Puig.
About 60 years ago, R. Brauer introduced "block theory"; his purpose was to study the group algebra kG of a finite group G over a field k of nonzero characteristic p: any indecomposable two-sided ideal that also is a direct summand of kG determines a G-block. But the main discovery of Brau...
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