Introduces the relative Rees algebra of Ga,S-actions on relative affine schemes, establishes its basic properties, and applies it to examples from locally nilpotent derivations and families of affine threefolds.
Kaliman, Proper Ga-actions on C4 preserving a coordinate, Algebra Number Theory V olume 12, Number 2 (2018), 227-258
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Rees algebras of additive group actions
Introduces the relative Rees algebra of Ga,S-actions on relative affine schemes, establishes its basic properties, and applies it to examples from locally nilpotent derivations and families of affine threefolds.