Takagi's log canonicity and dense sharp F-purity conjecture
Takagi's log canonicity and dense sharp F-purity conjecture
Let be a normal variety over an algebraically closed field of characteristic zero, and let be an effective -divisor on such that is -Cartier. Let be a formal combination, where the are nonnegative rational numbers and the are proper closed subschemes of . Fix a point . Log canonicity–dense sharp -purity conjecture.
- is log canonical at if and only if it is of dense sharply -pure type at .
- If is log canonical at , then for any model of over a finitely generated -subalgebra of , there is a dense subset of closed points such that
for every . The conjecture proposes an arithmetic correspondence between log canonicity and sharp -purity, extending the known correspondence between klt singularities and strongly -regular type. The source describes this correspondence as largely conjectural and does not state a resolution.
Sources & referencesView supporting material
Primary source
Shunsuke Takagi, “Adjoint ideals and a correspondence between log canonicity and F-purity”, arXiv:1105.0072 (2013).
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