Mathematics – Operator Algebras
Scientific paper
2010-03-29
Mathematics
Operator Algebras
9 pages, LaTeX, one erroneous statement removed
Scientific paper
We compare algebraic objects related to a compact quantum group action on a unital C*-algebra in the sense of Podle\'s and Baum et al. and show that they differ by the kernel of the morphism describing the action. Then we address ways to remove the kernel without changing the Podle\'s algebraic core. A minimal such procedure is described. We end the paper with a natural example of an action of a reduced compact quantum group with non-trivial kernel.
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