Jonsson–Mustaţă's weighted weak and strong conjectures for log canonical thresholds

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Let XX be a regular algebraic variety over a field of characteristic zero. Let a∙\mathfrak{a}_{\bullet} be a graded sequence of ideals on XX, and let q\mathfrak{q} be a nonzero ideal on XX such that lctq(a∙)<∞\mathrm{lct}^{\mathfrak{q}}(\mathfrak{a}_{\bullet})<\infty. A valuation v∈ValX∗v\in\mathrm{Val}_X^* computes lctq(a∙)\mathrm{lct}^{\mathfrak{q}}(\mathfrak{a}_{\bullet}) when

lctq(a∙)=A(v)+v(q)v(a∙).\mathrm{lct}^{\mathfrak{q}}(\mathfrak{a}_{\bullet})=\frac{A(v)+v(\mathfrak{q})}{v(\mathfrak{a}_{\bullet})}.

Jonsson–Mustaţă's weighted conjecture. The weak version asserts that there exists a quasi-monomial valuation v∈ValX∗v\in\mathrm{Val}_X^* computing lctq(a∙)\mathrm{lct}^{\mathfrak{q}}(\mathfrak{a}_{\bullet}); the strong version asserts that every valuation v∈ValX∗v\in\mathrm{Val}_X^* computing lctq(a∙)\mathrm{lct}^{\mathfrak{q}}(\mathfrak{a}_{\bullet}) is quasi-monomial.

These are the weighted variants of Jonsson–Mustaţă's conjectures, with the ideal q\mathfrak{q} incorporated into the jumping number. The source does not specify whether the weak or strong version is resolved.

References

Primary source

Shijie Bao, Qi'an Guan and Lin Zhou, “Algebraic Zhou valuations”, arXiv:2505.19451 (2025).

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