Nuclear spaces on a locally compact group
Objects Dual to Subsemigroups of Groups.
On -cocycles induced by a positive definite function on a locally compact abelian group
For a normalized positive definite function on a locally compact abelian group , let be the unitary representation associated to by the GNS construction. We give necessary and sufficient conditions for the vanishing of 1-cohomology and reduced 1-cohomology . For example, if and only if either or , where is the trivial character of and is the probability measure on the Pontryagin dual associated to by Bochner’s Theorem. This streamlines an argument of Guichardet (see Theorem...
On a certain L-ideal of the measure algebra
On a class of convolution algebras of functions
The Banach spaces defined in this paper consist essentially of those elements of ( being a locally compact group) which can in a certain sense be well approximated by functions with compact support. The main result of this paper is the fact that in many cases becomes a Banach convolution algebra. There exist many natural examples. Furthermore some theorems concerning inclusion results and the structure of these spaces are given. In particular we prove that simple conditions imply the existence...
On a Class of Generalized Gelfand Pairs.
On a class of weakly almost periodic mappings.
On a covering group theorem and its applications.
On a family of weighted convolution algebras.
On a family of weighted spaces
On a family of Wiener type spaces.
On a Formula for Haar Measure in Compact Groups.
On a generalization of Abelian sequential groups
Let (G,τ) be a Hausdorff Abelian topological group. It is called an s-group (resp. a bs-group) if there is a set S of sequences in G such that τ is the finest Hausdorff (resp. precompact) group topology on G in which every sequence of S converges to zero. Characterizations of Abelian s- and bs-groups are given. If (G,τ) is a maximally almost periodic (MAP) Abelian s-group, then its Pontryagin dual group is a dense -closed subgroup of the compact group , where is the group G with the discrete...
On a joint generalization of Cauchy's and d'Alembert's functional equations.
On a Limit Theorem of Measures.
On a linear functional equation.
On a method of determining supports of Thoma's characters of discrete groups
We present a new approach to determining supports of extreme, normed by 1, positive definite class functions of discrete groups, i.e. characters in the sense of E. Thoma [8]. Any character of a group produces a unitary representation and thus a von Neumann algebra of linear operators with finite normal trace. We use a theorem of H. Umegaki [9] on the uniqueness of conditional expectation in finite von Neumann algebras. Some applications and examples are given.
On a New Segal Algebra.
On a recurrence formula for elementary spherical functions on symmetric spaces and its applications to multipliers for the spherical Fourier transform.
On a semigroup of measures with irregular densities
We study the densities of the semigroup generated by the operator on the 3-dimensional Heisenberg group. We show that the 7th derivatives of the densities have a jump discontinuity. Outside the plane x=0 the densities are . We give explicit spectral decomposition of images of in representations.