2 papers
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.