Results 251 to 260 of about 146,027 (294)

On the measure-theoretic entropy and topological pressure of free semigroup actions

Ergodic Theory and Dynamical Systems, 2016
In this paper we introduce the notions of topological pressure and measure-theoretic entropy for a free semigroup action. Suppose that a free semigroup acts on a compact metric space by continuous self-maps.
Xiaogang Lin, Dongkui Ma, Yupan Wang
semanticscholar   +1 more source

Semigroup Actions of Expanding Maps

, 2016
We consider semigroups of Ruelle-expanding maps, parameterized by random walks on the free semigroup, with the aim of examining their complexity and exploring the relation between intrinsic properties of the semigroup action and the thermodynamic ...
M. Carvalho, F. Rodrigues, P. Varandas
semanticscholar   +1 more source

Semigroup C * -algebras

, 2016
This is a survey article about recent developments in semigroup C*-algebras. These C*-algebras generated by left regular representations of semigroups have been studied for some time, but it was only recently that several new connections and results were
Xin Li
semanticscholar   +1 more source

Betti numbers for numerical semigroup rings

, 2016
We survey results related to the magnitude of the Betti numbers of numerical semigroup rings and of their tangent cones.
Dumitru I. Stamate
semanticscholar   +1 more source

The tight groupoid of an inverse semigroup

Semigroup Forum, 2014
In this work we present algebraic conditions on an inverse semigroup S\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek ...
R. Exel, Enrique Pardo
semanticscholar   +1 more source

The structure of a graph inverse semigroup

, 2014
Given any directed graph E one can construct a graph inverse semigroupG(E), where, roughly speaking, elements correspond to paths in the graph. In this paper we study the semigroup-theoretic structure of G(E).
Z. Mesyan, J. D. Mitchell
semanticscholar   +1 more source

The minimal number of generators of a finite semigroup

, 2013
The rank of a finite semigroup is the smallest number of elements required to generate the semigroup. A formula is given for the rank of an arbitrary (not necessarily regular) Rees matrix semigroup over a group.
R. Gray
semanticscholar   +1 more source

The Problem of Solvability of Equations in a Free Semigroup

, 1977
In this paper we construct an algorithm recognizing the solvability of arbitrary equations in a free semigroup.Bibliography: 4 titles.
G. Makanin
semanticscholar   +1 more source

Radicals of semigroups and semigroup algebras

Sbornik: Mathematics, 2010
In the paper, diverse lower radicals of semigroups are considered, and it is shown how these radicals can be used when evaluating the prime radical of group and semigroup algebras. Conditions are found under which the prime radical of a group algebra coincides with an ideal generated by some congruence. Bibliography: 22 titles.
openaire   +2 more sources

Topological pressure and topological entropy of a semigroup of maps

, 2011
By using the Caratheodory-Pesin structure(C-P structure), with respect to arbitrary subset, the topological pressure and topological entropy, introduced for a single continuous map, is generalized to the cases of semigroup of continuous maps.
Dongkui Ma, Min Wu
semanticscholar   +1 more source