The nth Amitsur group is a stable G-birational invariant of smooth projective G-varieties over char-0 fields for all n≥2.
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math.AG 2years
2026 2verdicts
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The authors classify all finite group actions on cubic threefolds that make the threefold G-birationally rigid.
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Birational invariance of higher Amitsur groups
The nth Amitsur group is a stable G-birational invariant of smooth projective G-varieties over char-0 fields for all n≥2.
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G-birationally rigid cubic threefolds
The authors classify all finite group actions on cubic threefolds that make the threefold G-birationally rigid.