Author:
Andruskiewitsch Nicolás,Mombelli Juan Martín
Abstract
AbstractWe construct explicit examples of weak Hopf algebras (actually face algebras in the sense of Hayashi [H]) via vacant double groupoids as explained in [AN]. To this end, we first study the Kac exact sequence for matched pairs of groupoids and show that it can be computed via group cohomology. Then we describe explicit examples of finite vacant double groupoids.
Publisher
Cambridge University Press (CUP)
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