The prismatic–de Rham–Witt comparison conjecture for special perfect prisms

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Let (A,d)(A,d) be a perfect prism such that A/dA/d is pp-torsion free, and let SS be a smooth A/dA/d-algebra. Here WnΩS/(A/d)iW_n\Omega_{S/(A/d)}^i denotes the degree-ii de Rham–Witt group, and Hi(\mathlarger\mathbblΔS/A⊗ALA/d…ϕn−1(d))H^i({\mathlarger{\mathbbl{\Delta}}}_{S/A}\otimes^L_A A/d\ldots\phi^{n-1}(d)) denotes the degree-ii cohomology of the indicated prismatic complex after derived base change. Prismatic–de Rham–Witt comparison conjecture. There is a functorial isomorphism

WnΩS/(A/d)i→Hi(\mathlarger\mathbblΔS/A⊗ALA/d…ϕn−1(d)).W_n\Omega_{S/(A/d)}^i\to H^i({\mathlarger{\mathbbl{\Delta}}}_{S/A}\otimes^L_A A/d\ldots\phi^{n-1}(d)).

This conjecture proposes a comparison between de Rham–Witt forms and prismatic cohomology for smooth algebras over the quotient of a perfect prism. Its status is not resolved by the supplied source context.

References

Primary source

Semen Molokov, “Prismatic cohomology and de Rham-Witt forms”, arXiv:2008.04956 (2025).

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