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math.AG2018★ 5 cited
An arithmetic topos for integer matrices
Jens Hemelaer
We study the topos of sets equipped with an action of the monoid of regular matrices over the integers. In particular, we show that the topos-theoretic points are give…
math.AG2017★ 1 cited
Azumaya toposes
Jens Hemelaer
In arXiv:1606.07885, many different Grothendieck topologies were introduced on the category of Azumaya algebras. Here we give a classification in terms of sets of supernatural numb…