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math.AG2019
The Monsky--Washnitzer topos
Dingxin Zhang
Mimicking Ogus's construction, we define a site, for varieties over a field of char. p > 0, using Monsky--Washnitzer algebras/weak formal schemes. We prove a comparison theorem bet…
math.AG2019
-hypergeometric systems and relative cohomology
Tsung-Ju Lee, Dingxin Zhang
We investigate the space of solutions to certain -hypergeometric -modules, which were defined and studied by Gelfand, Kapranov, and Zelevinsky. We show that the sol…