Evaluation maps, slopes, and algebraicity criteria
Jean-Benoît Bost
Université Paris-Sud, Orsay, France
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Abstract
We discuss criteria for the algebraicity of a formal subscheme V^ in the completion X^P at some rational point P of an algebraic variety X over some field K. In particular we consider the case where K is a function field or a number field, and we discuss applications concerning the algebraicity of leaves of algebraic foliations, algebraic groups, absolute Tate cycles, and the rationality of germs of formal functions on a curve over a number field.