Constructing (almost) rigid rings and a UFD having infinitely generated Derksen and Makar-Limanov invariant

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dc.creatorFinston, David
dc.creatorMaubach, Stefan
dc.date2007-06-28
dc.date.accessioned2026-07-07T08:12:52Z
dc.date.available2026-07-07T08:12:52Z
dc.descriptionAn example is given of a UFD which has infinitely generated Derksen invariant. The ring is \textquotedblleft almost rigid\textquotedblright\ meaning that the Derksen invariant is equal to the Makar-Limanov invariant. Techniques to show that a ring is (almost) rigid are discussed, among which is a generalization of Mason's abc-theorem.
dc.descriptionAccepted to Canad. Math. Bull
dc.identifierhttps://arxiv.org/abs/0706.4184
dc.identifierhttp://arxiv.org/abs/0706.4184
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/132605
dc.subjectAlgebraic Geometry
dc.subjectCommutative Algebra
dc.subject14R20, 13A50, 13N15.
dc.titleConstructing (almost) rigid rings and a UFD having infinitely generated Derksen and Makar-Limanov invariant
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