Inversion of adjunction for rational pairs

Let (X,D)(X,D) be a pair with DD a reduced Weil divisor. Let HH be a Cartier divisor on XX with no components in common with DD. Assume that (H,DH)(H,D\cap H) is Du Bois and that (XH,DH)(X\setminus H,D\setminus H) is a rational pair. Inversion of adjunction for rational pairs. Then (X,D)(X,D) is a rational pair. This proposed variant of inversion of adjunction would extend the preceding results, including the case D=0D=0, by deducing rationality of the pair on XX from Du Bois behavior along HH and rationality away from HH; the text presents it as a statement the authors would like to prove.

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Primary source

Sándor J Kovács and Karl Schwede, “Inversion of adjunction for rational and Du Bois pairs”, arXiv:1311.7193 (2016).

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