Biextensions of 1-motives by 1-motives

Details Biextensions of 1-motives by 1-motives Biextensions of 1-motives by 1-motives

2004-02-05

arxiv.org/abs/math/0402080v1

C. R. Math. Rep. Acad. Sci. Canada 27 (2005), no. 3, pp. 65--71.

Mathematics

Number Theory

15 pages

Scientific paper

Let S be a scheme. In this paper, we define the notion of biextensions of 1-motives by 1-motives. If M(S) denotes the Tannakian category generated by 1-motives over S (in a geometrical sense), we define geometrically the morphisms of M(S) from the tensor product of two 1-motives M_1 and M_2 to another 1-motive M_3, to be the isomorphism classes of biextensions of (M_1,M_2) by M_3. Generalizing this definition we obtain, modulo isogeny, the geometrical notion of morphism of M(S) from a finite tensor product of 1-motives to another 1-motive.

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