On an injectivity lemma in the proof of Tannakian duality
classification
🧮 math.RA
math.CTmath.RT
keywords
algebrasdualityinjectivitylemmaproofshorttannakiancase
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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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