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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.AG2001
Ideal Classes of the Weyl Algebra and Noncommutative Projective Geometry (with an Appendix by M. Van den Bergh)
Yuri Berest, George Wilson
Let R be the set of isomorphism classes of ideals in the Weyl algebra , and let C be the set of isomorphism classes of triples (V; X, Y), where V is a finite-dimensional (…