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Motivic Galois theory for motives of level ≤ 1

URN to cite this document:
Bertolin, Cristiana
Date of publication of this fulltext: 27 Nov 2009 07:04


Let T be a Tannakian category over a field k of characteristic 0 and \pi(T) its fundamental group. In this paper we prove that there is a bijection between the otimes-equivalence classes of Tannakian subcategories of T and the normal affine group sub-T-schemes of \pi(T). We apply this result to the Tannakian category T_1(k) generated by motives of niveau \leq 1 defined over k, whose fundamental ...


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