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math.QA2003★ 99 cited
Semigroups of I-type
Tatiana Gateva-Ivanova, Michel Van den Bergh
Assume that is a semigroup generated by , and let $\Uscr$ be the multiplicative free commutative semigroup generated by . We say that is o…
math.QA1998
Blowing up non-commutative smooth surfaces
Michel Van den Bergh
In this paper we will think of certain abelian categories with favorable properties as non-commutative surfaces. We show that under certain conditions a point on a non-commutative…