7 citations · 12 across the 5 of their papers we have counts for
4 papers · 1 filter
The primitive ideal space of the C*-algebras of infinite graphs
Jeong Hee Hong, Wojciech Szymanski
For any countable directed graph E we describe the primitive ideal space of the corresponding generalized Cuntz-Krieger algebra C*(E).
Stable rank of graph algebras. Type I graph algebras and their limits
Klaus Deicke, Jeong Hee Hong, Wojciech Szymanski
For an arbitrary countable directed graph E we show that the only possible values of the stable rank of the associated Cuntz-Krieger algebra C*(E) are 1, 2 or \infty. Explicit crit…
A cocycle for the comultiplication on the quantum SU(2) group
Wojciech Szymanski
For the family Delta_q, q in [0,1), of the SU_q(2)-comultiplications on the C*-algebra A\cong C(SU_q(2)), we show that there exist unitary operators Omega_q such that Delta_q(x)=Om…
Quantum lens spaces and principal actions on graph C*-algebras
Wojciech Szymanski
We study certain principal actions on noncommutative C*-algebras. Our main examples are the Z_p- and T-actions on the odd-dimensional quantum spheres, yielding as fixed-point algeb…