Log weak Lefschetz conjecture for log isocrystalline cohomologies
Log weak Lefschetz conjecture for log isocrystalline cohomologies
Let be a projective SNCL scheme over the log point , let be a horizontal smooth divisor on , and let . Let be a nonnegative integer. Write and, for a -module , write . The closed immersion induces
The cohomology groups carry weight filtrations .
Log weak Lefschetz conjecture. Assume that is ample. Then the morphism above is a filtered isomorphism with respect to if and strictly injective for .
This is a logarithmic analogue of the weak Lefschetz theorem for log crystalline cohomology. The source introduces it as a conjecture and gives an affirmative result, but the supplied text does not specify whether the full conjecture is resolved.
Sources & referencesView supporting material
Primary source
Yukiyoshi Nakkajima and Fuetaro Yobuko, “Degenerations of log Hodge de Rham spectral sequences, log Kodaira vanishing theorem in characteristic p>0 and log weak Lefschetz conjecture for log crystalline cohomologies”, arXiv:1902.09110 (2022).
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