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Actions of the additive group G a on certain noncommutative deformations of the plane

Ivan KaygorodovSamuel A. LopesFarukh Mashurov — 2021

Communications in Mathematics

We connect the theorems of Rentschler [] and Dixmier [] on locally nilpotent derivations and automorphisms of the polynomial ring A 0 and of the Weyl algebra A 1 , both over a field of characteristic zero, by establishing the same type of results for the family of algebras A h = x , y y x - x y = h ( x ) , where h is an arbitrary polynomial in x . In the second part of the paper we consider a field 𝔽 of prime characteristic and study 𝔽 [ t ] comodule algebra structures on A h . We also compute the Makar-Limanov invariant of absolute constants...

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