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Mathematics  2013 

On Strongly $F$-Regular Inversion of Adjunction

DOI: 10.1016/j.jalgebra.2015.03.025

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Abstract:

In this article we give two independent proofs of the positive characteristic analog of the log terminal inversion of adjunction. We show that for a pair $(X, S+B)$ in characteristic $p>0$, if $(S^n, B_{S^n})$ is strongly $F$-regular, then $S$ is normal and $(X, S+B)$ is purely $F$-regular near $S$. We also answer affirmatively an open question about the equality of $F$-Different and Different.

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