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math.AC2026
When is Frobenius epic?
Javier Carvajal-Rojas, Rankeya Datta, Noah Olander +1
We prove that a homomorphism of rings of prime characteristic is b-nil formally unramified if and only if its relative Frobenius is an epimorphism. We specialize this result under…
math.AC2025
A characteristic analog of formal lifting properties
Rankeya Datta, Noah Olander
A field extension of characteristic is formally étale if and only if the relative Frobenius of is an isomorphism. Inspired by this classical result, we explore…