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math.AG2026
On p-Jordan constant of Cremona group of rank 2 in odd characteristic
Yifei Chen, Constantin Shramov
We bound the indices of normal abelian subgroups in finite groups contained in the Cremona group of rank 2 over a field of odd characteristic.
math.AG2024
Automorphisms of surfaces over fields of positive characteristic
Yifei Chen, Constantin Shramov
We study automorphism and birational automorphism groups of varieties over fields of positive characteristic from the point of view of Jordan and -Jordan property. In particular…