Weak C*-Hopf Algebras and Multiplicative Isometries
Abstract
We show how the data of a finite dimensional weak C*-Hopf algebra can be encoded into a pair (H,V) where H is a finite dimensional Hilbert space and V: H H --> H H is a partial isometry satisfying, among others, the pentagon equation. In case of V being unitary we recover the Baaj-Skandalis multiplicative unitary of the discrete compact type. Relation to the pseudo- multiplicative unitary approach proposed by J.-M. Vallin and M. Enock is also discussed.
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