Mathematics – Operator Algebras
Scientific paper
2009-05-23
Comm. Math. Phys. 298 (2010), 343-356
Mathematics
Operator Algebras
16 pages
Scientific paper
We introduce and study two new examples of noncommutative spheres: the half-liberated sphere, and the free sphere. Together with the usual sphere, these two spheres have the property that the corresponding quantum isometry group is "easy", in the representation theory sense. We present as well some general comments on the axiomatization problem, and on the "untwisted" and "non-easy" case.
Banica Teodor
Goswami Debashish
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