3 papers
math.AG2025
Varieties with free tangent sheaves
Damian Rössler, Stefan Schröer
We coin the term \emph{-trivial varieties} to denote smooth proper schemes over ground fields whose tangent sheaf is free. Over the complex numbers, this are precisely the a…
math.AG2025
The Iskovskih Theorem for regular surfaces over imperfect fields
Andrea Fanelli, Stefan Schröer
We generalize Iskovskih's theorem about surfaces without irregularity and bigenus from the smooth case to regular surfaces over arbitrary fields, with special focus on the case of…
math.AG2025
Rational points in coarse moduli spaces and twisted representations
Fabian Korthauer, Stefan Schröer
We study moduli spaces and moduli stacks for representations of associative algebras in Azumaya algebras, in rather general settings. We do not impose any stability condition and w…