# Publishing house / Banach Center Publications / All volumes

## When is a quantum space not a group?

### Volume 91 / 2010

Banach Center Publications 91 (2010), 353-364 MSC: Primary 46L89, 46L85, 17B37; Secondary 81R60, 20G42. DOI: 10.4064/bc91-0-21

#### Abstract

We give a survey of techniques from quantum group theory which can be used to show that some quantum spaces (objects of the category dual to the category of ${\rm C}^*$-algebras) do not admit any quantum group structure. We also provide a number of examples which include some very well known quantum spaces. Our tools include several purely quantum group theoretical results as well as study of existence of characters and traces on ${\rm C}^*$-algebras describing the considered quantum spaces as well as properties such as nuclearity.

#### Authors

• Piotr Mikołaj SołtanInstitute of Mathematics of the Polish Academy of Sciences
and
Department of Mathematical Methods in Physics
Faculty of Physics
University of Warsaw
Poland
e-mail

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