Shokurov's Gorensteinness conjecture for quotient singularities

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Let XX be an nn-dimensional Q\mathbb{Q}-Gorenstein variety, let p∈Xp\in X be a closed point, and let mld⁡p(X)\operatorname{mld}_p(X) denote the minimal log discrepancy at pp.

Shokurov's Gorensteinness conjecture. The following assertions hold:

  1. mld⁡p(X)≤n\operatorname{mld}_p(X)\leq n.
  2. If mld⁡p(X)>n−1\operatorname{mld}_p(X)>n-1, then XX is smooth at pp.
  3. If mld⁡p(X)=n−1\operatorname{mld}_p(X)=n-1, then XX is Gorenstein at pp.

The source states that this conjecture is proved for quotient singularities, including the assertion that one can take r(n,n−1)=1r(n,n-1)=1 in the index conjecture.

References

Primary source

Yusuke Nakamura and Kohsuke Shibata, “Shokurov's index conjecture for quotient singularities”, arXiv:2209.04845 (2024).

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