Linear coactions of discrete quantum groups on the circle

Debashish Goswami, Suchetana Samadder

For a (unital) $C^{\ast }$-algebra $\cla$, we construct a $C^{\ast }$-algebraic discrete quantum group (DQG) $\clq_{\rm aut}(\cla)$, coacting on $\cla$, which is a quantum generalization of ${…