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# Journal of Operator Theory

Volume 45, Issue 2, Spring 2001  pp. 357-376.

Weak $C^*$-Hopf algebras and multiplicative isometries

Authors Gabriella Bohm (1), and Kornel Szlachanyi (2)
Author institution: (1) Research Institute for Particle and Nuclear Physics, P.O.B. 49, H--1525 Budapest 114, Hungary
(2) Research Institute for Particle and Nuclear Physics, P.O.B. 49, H--1525 Budapest 114, Hungary

Summary:  We show how the data of a finite dimensional weak $C^*$-Hopf algebra can be encoded into a pair $(\Hil,V)$ where $\Hil$ is a finite dimensional Hilbert space and $V\colon\Hil\o\Hil\to\Hil\o\Hil$ 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 with the pseudomultiplicative unitary approach proposed by J.-M. Vallin and M. Enock is also discussed.

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