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On an injectivity lemma in the proof of Tannakian duality (1510.02714v1)
Published 9 Oct 2015 in math.RA, math.CT, and math.RT
Abstract: In this short work we give a very short and elementary proof of the injectivity lemma, which plays an important role in the Tannakian duality for Hopf algebras over a field. Based on this we provide some generalizations of this fact to the case of flat algebras over a noetherian domain.
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