For an almost normal subgroup 0 of a discrete group , conditions are given which allow one to dene a universal C-norm on the Hecke algebra H( ; 0). If is a semidirect product of a normal subgroup N… Expand

Given an irrational number «, Aa is the unique C*-algebra generated by two unitary operators, U and V, satisfying the twisted commutation relation UV= exp(2 πia)VU. We investigate separable… Expand

A version of Cuntz-Krieger algebras associated with infinite, possibly infinite valued matrices with any number of zero entries correspond to C ⁄ -algebras of directed graphs with any number of… Expand

For a $C^*$-correspondence $\mathcal{E}$ over a $C^*$-algebra $A$ the restricted correspondence $\mathcal{R}(\mathcal{E})$ over the ideal $I=\overline{\langle\mathcal{E},\mathcal{E}\rangle}$ of $A$… Expand

Multiplication by x determines an automorphism of the compact dualgroupof A^ = Z[x, x~1]/(g) for j e Z[x]. We determine the AT-groups of the C*-algebra associated with this dynamical system if g is… Expand

Certain -semigroups are associated with the universal C -algebra generated by a partial isometry, which is itself the universal C -algebra of a -semigroup. A fundamental role for a -structure on a… Expand

For a general C*-correspondence E a canonical saturated invariant ideal, on which the correspondence is not supported, is identified. The quotient correspondence is formed and the Cuntz-Pimsner… Expand