Holmstrom Orbifold (Chen-Ruan) cohomology

Orbifold (Chen-Ruan) cohomology

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Orbifold (Chen-Ruan) cohomology

http://mathoverflow.net/questions/77246/what-is-the-right-deifinition-of-the-homologycohomology-of-an-orbifold

nLab page on Orbifold (Chen-Ruan) cohomology