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paper

A Remark on Letzter-Makar-Limanov Invariants

arXiv:math/0304154

Abstract

We give a natural cohomological interpretation of Letzter-Makar-Limanov invariants for rings of differential operators on algebraic curves.

7 pages, to appear in the Proceedings of the Workshop ``Commutative Algebra, Algebraic Geometry and Representation Theory'' (Fields Institute, Toronto, August 2002)