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.
References
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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