3 papers
math.QA2006
Unramified reductors of filtered and graded algebras
Cornel Baetica, Freddy Van Oystaeyen
It is a fairly known fact that most of the algebras appearing in the theory of rings of differential operators, quantized algebras of different kinds (including many quantum groups…
math.RA2005
Valuation Extensions of Filtered and Graded Algebras
C. Baetica, F. Van Oystaeyen
In this note we relate the valuations of the algebras appearing in the non-commutative geometry of quantized algebras to properties of sub-lattices in some vector spaces. We consid…
math.AC2002
Cohen-Macaulay classes which are not conic
Cornel Baetica
We provide two examples which show that for an affine semigroup ring the set of Cohen-Macaulay classes can be larger than the set of conic classes.