Introduces unipotent morphisms of algebraic stacks, proves a descent result for flags, and derives applications including a unipotent analogue of Gabber's theorem and the resolution property for certain stacks in positive characteristic.
Mathur, Experiments on the B rauer map in high codimension , Algebra Number Theory (2021), to appear
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Unipotent morphisms
Introduces unipotent morphisms of algebraic stacks, proves a descent result for flags, and derives applications including a unipotent analogue of Gabber's theorem and the resolution property for certain stacks in positive characteristic.