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On some Schur algebras

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Abstract

A Schur algebra was generalized to projective Schur algebraby admitting twisted group algebra.A Schur algebra is a projective Schur algebra with trivial 2-cocycle.In this paper we study situations that Schur algebra is a projectiveSchur algebra with nontrivial cocycle, andwe find a criterion for a projective Schur algebra to be a Schur algebra.

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