Multiplicity bound conjecture in terms of minimal log discrepancies

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Let x∈Xx\in X be a point on a variety with log canonical singularities. Denote e:=dim⁡mx/mx2e:=\dim m_x/m_x^2 and d:=dim⁡Xd:=\dim X at xx. The minimal log discrepancy at xx is denoted by mldx(X)\mathrm{mld}_x(X). Multiplicity bound conjecture. If mldx(X)>k−1\mathrm{mld}_x(X)>k-1 for some integer 0≤k≤d0\le k\le d, then

multxX≤(e−kd−k).\mathrm{mult}_xX\le \binom{e-k}{d-k}.

Moreover, equality holds when k=d−1k=d-1. This proposed bound generalizes the preceding multiplicity bounds for varieties with Du Bois and rational singularities. Its status is not established in the supplied text.

References

Primary source

Sung Gi Park, “Upper bound on the multiplicity of rational and Du Bois singularities”, arXiv:2509.21807 (2025).

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