Geodesic
Actions of the additive group $ {G}_a$ on certain noncommutative deformations of the plane
Communications in Mathematics, Tome 29 (2021) no. 2, pp. 269-279

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We connect the theorems of Rentschler \cite {rR68} and Dixmier \cite {jD68} 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 $$A _h=\langle x, y\mid yx-xy=h(x)\rangle \,,$$ where $h$ is an arbitrary polynomial in $x$. In the second part of the paper we consider a field $\mathbb{F}$ of prime characteristic and study $\mathbb{F}[t]$\HH comodule algebra structures on $A _h$. We also compute the Makar-Limanov invariant of absolute constants of $A _h$ over a field of arbitrary characteristic and show how this subalgebra determines the automorphism group of $A _h$.
Classification : 13N15, 16S10, 16S32, 16W20
Keywords: Derivations; iterative higher derivations; rings of differential operators; Weyl algebra 
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     author = {Kaygorodov, Ivan and Lopes, Samuel A. and Mashurov, Farukh},
     title = {Actions of the additive group $ {G}_a$ on certain noncommutative deformations of the plane},
     journal = {Communications in Mathematics},
     pages = {269--279},
     publisher = {mathdoc},
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Kaygorodov, Ivan; Lopes, Samuel A.; Mashurov, Farukh. Actions of the additive group $ {G}_a$ on certain noncommutative deformations of the plane. Communications in Mathematics, Tome 29 (2021) no. 2, pp. 269-279. http://geodesic.mathdoc.fr/item/COMIM_2021__29_2_a8/