On G-spaces, equivariant homotopy theory and equivariant cohomology:
On braid group representations seen in the topological K-theory of the classifying space of the braid group:
On free group actions on n-spheres (or rather on product spaces of n-spheres):
On group cohomology of finite groups:
Alejandro Adem, Lectures on the cohomology of finite groups (pdf)
Alejandro Adem, R. James Milgram, Cohomology of Finite Groups, Springer 2004
On orbifolds:
On orbifolds, orbifold cohomology and specifically on Chen-Ruan cohomology and equivariant K-theory:
Alejandro Adem, Yongbin Ruan, Twisted Orbifold K-Theory, Commun. Math. Phys. 237 (2003) 533-556 (arXiv:math/0107168)
Alejandro Adem, Yongbin Ruan, Bin Zhang, A Stringy Product on Twisted Orbifold K-theory, Morfismos (10th Anniversary Issue), Vol. 11, No 2 (2007), 33-64. (arXiv:math/0605534, Morfismos pdf)
On orbifolds in mathematical physics and in particular in string theory:
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