The paper proves a generalized Barsotti-Weil formula, vanishing of Ext^2 for abelian schemes over general bases, and a complete computation of Ext^1(Ga,Gm) over Q, correcting earlier claims.
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Extensions of Abelian Schemes and the Additive Group
The paper proves a generalized Barsotti-Weil formula, vanishing of Ext^2 for abelian schemes over general bases, and a complete computation of Ext^1(Ga,Gm) over Q, correcting earlier claims.