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math.AG2025
Gerbes for trigonalizable group schemes
Noah Olander, Martin Olsson
We prove that smooth, separated Deligne--Mumford stacks in mixed characteristic with quasi-projective coarse moduli space are global quotient stacks and satisfy the resolution prop…
math.AG2025
Twisted derived categories and Rouquier functors
Martin Olsson
We study the algebraic structure of the automorphism group of the derived category of coherent sheaves on a smooth projective variety twisted by a Brauer class. Our main results ge…