Non-amenable finitely presented torsion-by-cyclic groups.
Non-amenable finitely presented torsion-by-cyclic groups
Note on reflexivity and invariant means.
On Amenable and Compact Groups.
On approximation of amenable groups by finite quasigroups.
On certain actions of semi-groups on L-spaces
On compact transformation groupoids
On convolution operators with small support which are far from being convolution by a bounded measure
Let be the left convolution operators on with support included in F and denote those which are norm limits of convolution by bounded measures in M(F). Conditions on F are given which insure that , and are as big as they can be, namely have as a quotient, where the ergodic space W contains, and at times is very big relative to . Other subspaces of are considered. These improve results of Cowling and Fournier, Price and Edwards, Lust-Piquard, and others.
On functional equations associated with characters of unitary representations of groups.
On functions with scattered spectra on lea groups
On generalized invariant means and separation theorems.
On invariant subalgebras of the Fourier-Stieltjes algebra of a locally compact group.
On left -biflat Banach algebras
We study the notion of left -biflatness for Segal algebras and semigroup algebras. We show that the Segal algebra is left -biflat if and only if is amenable. Also we characterize left -biflatness of semigroup algebra in terms of biflatness, when is a Clifford semigroup.
On projections of onto translation-invariant subspaces
On relative amenability for von Neumann algebras
On Separation in Reduced Duals of Groups with Compact Invariant Neighbourhoods of the Identity.
On some generalized invariant means and their application to the stability of the Hyers-Ulam type
We present some extension of the concept of an invariant mean to a space of vector-valued mappings defined on a semigroup. Next, we apply it to the study of the stability of some functional equation.
On some spaces of linear functionals on the algebras for locally compact groups
On some special measures on ßG.
On the Bohr Compactification of a Transformation Group.