Diophantine Approximation on Varieties IV: Derivated algebraic distance and derivative metric Bezout Theorem

Abstract

The metric Bezout Theorem proved in an earlier paper can be extended to a derivative version that compares derivatives of the algebraic distance of a point $\theta$ to two properly intersecting cycles in projective space with the derivatives of the algebraic distance of $\theta$ to their intersection. This improvement can be used to make algebraic independence criteria, to be proved in a forthcoming paper, more flexible and to refine Approximation results that are proved using the metric Bezout Theorem.