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21 votes
1 answer
2k views

Two conjectures by Gabber on Brauer and Picard groups

In a paper I need to make reference to two conjectures by Gabber, from Ofer Gabber, On purity for the Brauer group, in: Arithmetic Algebraic Geometry, MFO Report No. 37/2004, doi:10.14760/OWR-2004-37 ...
4 votes
0 answers
213 views

Reference request: Formal Existence for stacks

Is there a formal existence Theorem for coherent sheaves on locally Noetherian Artin Stacks, in the spirit of Grothendieck's Formal GAGA? Is it available for more general stacks?
3 votes
0 answers
123 views

Frobenius stratification of imperfect fields

Suppose $k$ is a (non-perfect) field of characteristic $p$, and $Fr$, its Frobenius map. I’d appreciate comments and references on the structure of the fitration/stratification of $k$ given by the ...
5 votes
2 answers
369 views

Links between tight closure and deformation theory

I am looking for links between tight closure and deformation theory. As a sample question: Question 1. Are there geometric interpretations in terms of deformation theory of Frobenius rationality? ...