Stanislaw Lech Woronowicz
Quantum spaces with an action of
quantum groups
Examples of quantum spaces endowed with an action of a quantum group will be
presented. One of the problem that is interesting is the existence
of invariant (reletively invariant and quasiinvariant measures) on such spaces.
Working in the framework of modular multiplicative unitaries one is able to
find explicit formulae describing such measures.