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math.AG2017★ 1 cited
Arithmetic D-modules on locally noetherian formal schemes
Richard Crew
We extend Berthelot's theory of arithmetic D-modules to a class of morphisms that are not necessarily of finite type. As an application we give a new construction of the category o…
math.AG2016
Rigidity and Frobenius Structure
Richard M. Crew
We show that an irreducible ordinary differential equation on the projective line has a Frobenius structure for a power of some prime p if it is rigid in the sense of Katz and sati…