Results 81 to 90 of about 21,261 (117)

On locally compact semitopological graph inverse semigroups

Matematychni Studii, 2018
In this paper we investigate locally compact semitopological graph inverse semigroups. Our main result is the following: if a directed graph $E$ is strongly connected and contains a finite amount of vertices then a locally compact semitopological graph inverse semigroup $G(E)$ is either compact or discrete.
openaire   +3 more sources

Structure of the Eberlein compactification of locally compact Heisenberg type group ZxTxT

, 2019
Given a locally compact group G, the Eberlein compactification G(e) is the spectrum of the uniform closure of the Fourier-Stieltjes algebra B(G). Hence, it is the semigroup compactification related to the unitary representations of G.
Elgun, Elcim
core   +1 more source

The semigroup of combinatorial configurations

, 2011
We elaborate on the existence and construction of the so-called combinatorial configurations. The main result is that for fixed degrees the existence of such configurations is given by a numerical semigroup.
Bras-Amorós, Maria,, Klara Stokes, Maria Bras-Amorós, Stokes, Klara,   +3 more
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Semigroup actions on posets and preimage quasi-orders

, 2012
Structures consisting of a semigroup of (partial) functions on a set X, a poset of subsets of X, and a preimage operation linking the two, arise commonly throughout mathematics.
Stokes, Tim E.
core   +1 more source

$Lmc-$compactification of a semitopological semigroup as a space of e-ultrafilters

, 2013
Let $S$ be a semitopological semigroup and $\mathcal{CB}(S)$ denotes the $C^*$-algebra of all bounded complex valued continuous functions on $S$ with uniform norm. A function $f\in \mathcal{CB}(S)$ is left multiplicative \linebreak continuous if and only if $\mathbf{T}_μf\in \mathcal{CB}(S)$ for all $μ$ in the spectrum of $\mathcal{CB}(S)$, where ...
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On semitopological simple inverse $\omega$-semigroups with compact maximal subgroups

Carpathian Mathematical Publications
We describe the structure of ($0$-)simple inverse Hausdorff semitopological $\omega$-semigroups with compact maximal subgroups. In particular, we show that if $S$ is a simple inverse Hausdorff semitopological $\omega$-semigroup with compact maximal subgroups, then $S$ is topologically isomorphic to the Bruck-Reilly extension $\left(\mathbf{BR}(T,\theta)
Gutik, Oleg, Maksymyk, Kateryna
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Compact semitopological semigroups and affine semigroups [PDF]

Czechoslovak Mathematical Journal, 1969
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Invariant means, right ideals and the structure of semitopological semigroups

Semigroup Forum, 1990
Let S be a semitopological semigroup, I be a right ideal of S and CB(S) be the \(C^*\)-algebra of bounded, complex valued continuous functions on S with the supremum norm and pointwise multiplication. Then CB(S) has a right invariant mean if and only if CB(I) has a right invariant mean. Moreover let F(S) be any one of WRUC(S), RUC(S), WAP(S) and AP(S).
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Invariant measures and the converse of Haar’s theorem on semitopological semigroups [PDF]

Pacific Journal of Mathematics, 1973
Mukherjea, A., Tserpes, N. A.
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Compact completely $0$-simple semitopological semigroups [PDF]

Proceedings of the American Mathematical Society, 1975
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