The Makar-Limanov and Derksen Invariants
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Locally nilpotent derivations are useful though rather elusive objects. Though on “majority” of rings we do not have them at all, when we have them it is rather hard to find them and even harder to find all of them or to give some qualitative statements. Even for polynomial rings we do not know too much.
KeywordsAutomorphism Group Polynomial Ring Characteristic Zero Algebraic Closure Algebraic Surface
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