Noncommutative curves and noncommutative surfaces

Details Noncommutative curves and noncommutative surfaces Noncommutative curves and noncommutative surfaces

1999-10-16

arxiv.org/abs/math/9910082v2

Mathematics

Rings and Algebras

Suggestions by many people (in particular Haynes Miller and Dennis Keeler) have been incorporated. The formulation of some res

Scientific paper

In this survey article we describe some geometric results in the theory of noncommutative rings and, more generally, in the theory of abelian categories. Roughly speaking and by analogy with the commutative situation, the category of graded modules modulo torsion over a noncommutative graded ring of quadratic, respectively cubic growth should be thought of as the noncommutative analogue of a projective curve, respectively surface. This intuition has lead to a remarkable number of nontrivial insights and results in noncommutative algebra. Indeed, the problem of classifying noncommutative curves (and noncommutative graded rings of quadratic growth) can be regarded as settled. Despite the fact that no classification of noncommutative surfaces is in sight, a rich body of nontrivial examples and techniques, including blowing up and down, has been developed.

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