Weak amenability for subfactors
Weak amenability for subfactors
We define the notions of weak amenability and the Cowling–Haagerup constant for extremal finite index subfactors s of type II 1 . We prove that the Cowling–Haagerup constant only depends on the standard invariant of the subfactor. Hence, we define the Cowling–Haagerup constant for standard invariants. We explicitly compute the …