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Introduction 1. Foundations 2. Cohomology, bundles and morphisms 3. Orbifold K-theory 4. Chen-Ruan cohomology 5. Calculating Chen-Ruan cohomology Bibliography Index.
Lie groupoids generalize transformation groups, and so provide a natural language for studying orbifolds and other noncommutative geometries. In this paper, we investigate a connection between… (More)