Mathematics – Algebraic Geometry
Scientific paper
2007-08-09
Selecta Mathematica 15, (2009) no. 3, 445--486
Mathematics
Algebraic Geometry
53 pages; v3: Substantial changes, including a completely new introduction
Scientific paper
10.1007/s00029-009-0001-7
The complete first order theories of the exponential differential equations of semiabelian varieties are given. It is shown that these theories also arises from an amalgamation-with-predimension construction in the style of Hrushovski. The theory includes necessary and sufficient conditions for a system of equations to have a solution. The necessary condition generalizes Ax's differential fields version of Schanuel's conjecture to semiabelian varieties. There is a purely algebraic corollary, the "Weak CIT" for semiabelian varieties, which concerns the intersections of algebraic subgroups with algebraic varieties.
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