The PIA conjecture for minimal log discrepancies

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Let (X,a)(X, \mathfrak{a}) be a log pair over an algebraically closed field kk of characteristic zero, and let DD be a normal Cartier prime divisor on XX. Let x∈Dx \in D be a closed point, and suppose that DD is not contained in the cosupport of the R\mathbb{R}-ideal sheaf a\mathfrak{a}. PIA conjecture. One has

mld⁡x(X,aOX(−D))=mld⁡x(D,aOD).\operatorname{mld}_x \bigl( X, \mathfrak{a} \mathcal{O}_X(-D) \bigr) = \operatorname{mld}_x (D, \mathfrak{a} \mathcal{O}_D).

This is the precise inversion of adjunction conjecture for minimal log discrepancies. The paper describes it as a fundamental conjecture; the supplied text gives no complete resolution, although it notes known cases for klt pairs.

References

Primary source

Yusuke Nakamura and Kohsuke Shibata, “A counterexample to the PIA conjecture for minimal log discrepancies”, arXiv:2404.06164 (2026).

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