For every non-degenerate product system over a unital subsemigroup of a discrete group, the reduced Hao-Ng isomorphism holds for generalised gauge actions of any locally compact Hausdorff group.
Weight theory for C*-algebraic quantum groups
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In this paper, we collect some technical results about weights on C*-algebras which are useful in de theory of locally compact quantum groups in the C*-algebra framework. We discuss the extension of a lower semi-continuous weight to a normal weight following S. Baaj, look into slice weights and their KSGNS-constructions and investigate the tensor product of weights together with a partial GNS-construction for such a tensor product. This paper accompanies our paper 'Locally compact quantum groups' in which we propose a relatively simple definition of a locally compact quantum group in the C*-algebra framework.
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The reduced Hao-Ng isomorphism problem for non-degenerate product systems
For every non-degenerate product system over a unital subsemigroup of a discrete group, the reduced Hao-Ng isomorphism holds for generalised gauge actions of any locally compact Hausdorff group.