Lemma on logarithmic derivative over directed manifolds

Abstract

In this paper, we generalize Ahlfors' lemma on logarithmic derivative to holomorphic tangent curves of directed projective manifolds intersecting closed subschemes. As a consequence, we obtain Algebro-Geometric Ahlfors' Lemma on Logarithmic Derivative (AALD for short) and General form of Algebro-Geometric Version of Ahlfors' Lemma on Logarithmic Derivative (GAALD for short) for holomorphic tangent curves of directed projective manifolds. We also get a transform of AALD and GAALD with respect to a linear system. Finally, we get the Second Main Theorem type results for holomorphic curves as the applications of GAALD and its transform.