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math.AG2026
Witt rings, Pfister forms, and equivariant birational geometry
Brendan Hassett, Yuri Tschinkel
We study equivariant birational geometry of quadrics with actions of finite groups and develop analogs of Witt groups and Pfister theory in the equivariant context.
math.AG2026
Invariants in equivariant birational geometry
Andrew Kresch, Yuri Tschinkel
We discuss invariants in equivariant birational geometry.