The rationality conjecture for a Du Bois divisor

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Let XX be a reduced scheme of finite type over a field of characteristic zero, and let DD be a Cartier divisor with Du Bois singularities. Assume that X∖DX\setminus D has rational singularities.

Rationality conjecture for a Du Bois divisor. Then XX has rational singularities, and in particular is Cohen–Macaulay.

This is proposed as a conjectural generalization of the result that a Du Bois Cartier divisor with smooth complement forces the ambient variety to have rational singularities. The source gives no resolution of this stronger statement.

References

Primary source

Sándor J. Kovács, “Singularities of stable varieties”, arXiv:1102.1240 (2012).

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