Inversion of adjunction for quotient singularities II: Non-linear actions

Abstract

We prove the precise inversion of adjunction formula for quotient singularities. As an application, we prove the semi-continuity of minimal log discrepancies for hyperquotient singularities. This paper is a continuation of arXiv:2011.07300, and we generalize the previous results to non-linear group actions.

arXiv comment54 pages. To appear in Algebraic Geometry