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7
votes
Matrix operations preserving the middle coefficients of characteristic polynomial
linear-algebra
ra.rings-and-algebras
asked Jan 18, 2019 at 20:22
mathoverflow.net
7
votes
Does perfect fraction field imply perfect residue field?
ag.algebraic-geometry
ac.commutative-algebra
characteristic-p
asked May 14, 2021 at 20:32
mathoverflow.net
5
votes
An fppf cover with trivial Picard group
ag.algebraic-geometry
ac.commutative-algebra
asked Oct 1, 2017 at 20:35
mathoverflow.net
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