Results 41 to 50 of about 468 (134)
Generalized $F$-semigroups [PDF]
, 2005 summary:A semigroup $S$ is called a generalized $F$-semigroup if there exists a group congruence on $S$ such that the identity class contains a greatest element with respect to the natural partial order $\le _{S}$ of $S$. Using the concept of an anticone,
Giraldes, E. +2 more
core +1 more source
On Endomorphism Universality of Sparse Graph Classes
Journal of Graph Theory, Volume 110, Issue 2, Page 223-244, October 2025.ABSTRACT We show that every commutative idempotent monoid (a.k.a. lattice) is the endomorphism monoid of a subcubic graph. This solves a problem of Babai and Pultr and the degree bound is best‐possible. On the other hand, we show that no class excluding a minor can have all commutative idempotent monoids among its endomorphism monoids. As a by‐product,
Kolja Knauer, Gil Puig i Surroca
wiley +1 more source
The Structure of φ‐Module Amenable Banach Algebras
Abstract and Applied Analysis, Volume 2014, Issue 1, 2014., 2014 We study the concept of φ‐module amenability of Banach algebras, which are Banach modules over another Banach algebra with compatible actions. Also, we compare the notions of φ‐amenability and φ‐module amenability of Banach algebras. As a consequence, we show that, if S is an inverse semigroup with finite set E of idempotents and l1(S) is a commutative
Mahmood Lashkarizadeh Bami +3 more
wiley +1 more source
Identities in the Algebra of Partial Maps
, 2005 We consider the identities of a variety of semigroup-related algebras modelling the algebra of partial maps. We show that the identities are intimately related to a weak semigroup deductive system and we show that the equational theory is decidable.
Marcel Jackson +3 more
core +1 more source
Hypercomplex operator calculus for the fractional Helmholtz equation
Mathematical Methods in the Applied Sciences, Volume 47, Issue 14, Page 11439-11472, 30 September 2024.In this paper, we develop a hypercomplex operator calculus to treat fully analytically boundary value problems for the homogeneous and inhomogeneous fractional Helmholtz equation where fractional derivatives in the sense of Caputo and Riemann–Liouville are applied.
Nelson Vieira +3 more
wiley +1 more source
On Minimal Fuzzy Ideals of Semigroups
Journal of Mathematics, Volume 2013, Issue 1, 2013., 2013 The present paper contains the sufficient condition of a fuzzy semigroup to be a fuzzy group using fuzzy points. The existence of a fuzzy kernel in semigroup is explored. It has been shown that every fuzzy ideal of a semigroup contains every minimal fuzzy left and every minimal fuzzy right ideal of semigroup.
Madad Khan +3 more
wiley +1 more source
A Porism Concerning Cyclic Quadrilaterals
Geometry, Volume 2013, Issue 1, 2013., 2013 We present a geometric theorem on a porism about cyclic quadrilaterals, namely, the existence of an infinite number of cyclic quadrilaterals through four fixed collinear points once one exists. Also, a technique of proving such properties with the use of pseudounitary traceless matrices is presented.
Jerzy Kocik, Michel Planat
wiley +1 more source
, 2017 Takahasi's Theorem on chains of subgroups of bounded rank in a free group is generalized to several classes of semigroups. As an application, it is proved that the subsemigroups of periodic points are finitely generated and periodic orbits are bounded ...
Mário J. J. Branco +2 more
core +1 more source
Regularity and Green′s Relations on a Semigroup of Transformations with Restricted Range
International Journal of Mathematics and Mathematical Sciences, Volume 2008, Issue 1, 2008., 2008 Let T(X) be the full transformation semigroup on the set X and let T(X, Y) = {α ∈ T(X) : Xα⊆Y}. Then T(X, Y) is a sub‐semigroup of T(X) determined by a nonempty subset Y of X. In this paper, we give a necessary and sufficient condition for T(X, Y) to be regular.
Jintana Sanwong +2 more
wiley +1 more source
Characterizing compact Clifford semigroups that embed into convolution and functor-semigroups [PDF]
Semigroup Forum, 2011 We study algebraic and topological properties of the convolution semigroups of probability measures on a topological groups and show that a compact Clifford topological semigroup $S$ embeds into the convolution semigroup $P(G)$ over some topological group $G$ if and only if $S$ embeds into the semigroup $\exp(G)$ of compact subsets of $G$ if and only ...
Banakh, Taras +3 more
openaire +3 more sources