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math.AG2000
Orbifold Quantum Cohomology
Weimin Chen, Yongbin Ruan
This is a research announcement of the theory of orbifold quantum cohomology.
math.AG2000
Discrete torsion and twisted orbifold cohomology
Yongbin Ruan
In this article, we study the twisting procedure of orbifold cohomology. We introduce local system and construct twisted orbifold cohomology. Then, we generalize Vafa-Witten's noti…