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math.AG2003
Differential Isomorphism and Equivalence of Algebraic Varieties
Yuri Berest, George Wilson
In this survey article we discuss the question: to what extent is an algebraic variety determined by its ring of differential operators? In the case of affine curves, this question…
math.AG2003
A Remark on Letzter-Makar-Limanov Invariants
Yuri Berest
We give a natural cohomological interpretation of Letzter-Makar-Limanov invariants for rings of differential operators on algebraic curves.