Results 101 to 110 of about 262,182 (221)
Finite groups are big as semigroups [PDF]
, 2011 We prove that a finite group G occurs as a maximal proper subsemigroup of an infinite semigroup (in the terminology of Freese, Ježek, and Nation, G is a big semigroup) if and only if |G| ≥ 3.
Ruskuc, Nik +3 more
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opological monoids of almost monotone injective co-finite partial selfmaps of positive integers
Karpatsʹkì Matematičnì Publìkacìï, 2010 In this paper we study the semigroup$mathscr{I}_{infty}^{,Rsh!!!earrow}(mathbb{N})$ of partialco-finite almost monotone bijective transformations of the set ofpositive integers $mathbb{N}$.
Chuchman I.Ya., Gutik O.V.
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An Extension of a result of Csiszar
International Journal of Mathematics and Mathematical Sciences, 1986 We extend the results of Csiszar (Z. Wahr. 5(1966) 279-295) to a topological semigroup S. Let μ be a measure defined on S. We consider the value of α=supKcompactlimn→∞supx∈Sμn(Kx−1). First. we show that the value of α is either zero or one.
P. B. Cerrito
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Topological Stability of Semigroup Actions and Shadowing
Journal of Dynamical and Control SystemsWe investigate expansiveness, topological stability, and shadowing for continuous actions of semigroups on compact Hausdorff spaces. We characterize semigroups for which all full shifts are expansive. We show that every expansive continuous monoid action on a compact Hausdorff space which has the shadowing property is topologically stable, and that a ...
Ceccherini-Silberstein, Tullio +2 more
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The largest proper congruence on S(X)
International Journal of Mathematics and Mathematical Sciences, 1984 S(X) denotes the semigroup of all continuous selfmaps of the topological space X. In this paper, we find, for many spaces X, necessary and sufficient conditions for a certain type of congruence to be the largest proper congruence on S(X).
K. D. Magill
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On the orbits of G-closure points of ultimately nonexpansive mappings
Fixed Point Theory and Applications, 2006 Let X be a closed subset of a Banach space and G an ultimately nonexpansive commutative semigroup of continuous selfmappings. If the G-closure of X is nonempty, then the closure of the orbit of any G-closure point is a commutative topological group.
Mo Tak Kiang
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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, +3 more
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Right simple subsemigroups and right subgroups of compact convergence semigroups
International Journal of Mathematics and Mathematical Sciences, 2000 Clifford and Preston (1961) showed several important characterizations of right groups. It was shown in Roy and So (1998) that, among topological semigroups, compact right simple or left cancellative semigroups are in fact right groups, and the closure ...
Phoebe Ho, Shing S. So
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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.
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Topological centers of semigroups and semigroup algebras
This thesis investigates the topological centres and Arens regularity of semigroups and their algebras. Following the work of Richard Arens, who introduced two distinct products (the Arens products) on the second dual of Banach algebras, the thesis' main
Askarisayah, Mehdi
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