Results 51 to 60 of about 9,544 (144)

A singular growth phenomenon in a Keller–Segel–type parabolic system involving density‐suppressed motilities

open access: yesMathematische Nachrichten, Volume 297, Issue 6, Page 2353-2364, June 2024.
Abstract A no‐flux initial‐boundary value problem for εuεt=Δ(uεvε−α),vεt=Δvε−vε+uε(★)$$\begin{equation*} \hspace*{92pt} \def\eqcellsep{&}\begin{array}{cc} \left\{ \def\eqcellsep{&}\begin{array}{ll} \varepsilon {u}_{\varepsilon t}& =\Delta ({u}_{\varepsilon}{v}_{\varepsilon}^{-\alpha}),\\ {v}_{\varepsilon t}& =\Delta{v}_{\varepsilon}-{v}_{\varepsilon ...
Yulan Wang, Michael Winkler
wiley   +1 more source

On a complete topological inverse polycyclic monoid

open access: yes, 2016
We give sufficient conditions when a topological inverse $\lambda$-polycyclic monoid $P_{\lambda}$ is absolutely $H$-closed in the class of topological inverse semigroups.
Bardyla, Serhii, Gutik, Oleg
core   +2 more sources

On dense, locally finite subgroups of the automorphism group of certain homogeneous structures

open access: yesMathematical Logic Quarterly, Volume 70, Issue 2, Page 162-172, May 2024.
Abstract Let A$\mathcal {A}$ be a countable structure such that each finite partial isomorphism of it can be extended to an automorphism. Evans asked if the age (set of finite substructures) of A$\mathcal {A}$ satisfies Hrushovski's extension property, then is it true that the automorphism group Aut(A)$\operatorname{{\it Aut}}(\mathcal {A})$ of A ...
Gábor Sági
wiley   +1 more source

On real analogues of the Poincaré series

open access: yesBulletin of the London Mathematical Society, Volume 56, Issue 1, Page 449-459, January 2024.
Abstract There exist several equivalent equations for the Poincaré series of a collection of valuations on the ring of germs of functions on a complex analytic variety. We give definitions of the Poincaré series of a collection of valuations in the real setting (i.e., on the ring of germs of functions on a real analytic variety), compute them for the ...
Antonio Campillo   +2 more
wiley   +1 more source

Graphs Connected to Isotopes of Inverse Property Quasigroups: A Few Applications

open access: yesJournal of Applied Mathematics, Volume 2024, Issue 1, 2024.
Many real‐world applications can be modelled as graphs or networks, including social networks and biological networks. The theory of algebraic combinatorics provides tools to analyze the functioning of these networks, and it also contributes to the understanding of complex systems and their dynamics.
Muhammad Nadeem   +3 more
wiley   +1 more source

New Concepts on Module Arens Regularity for Module Banach Algebras

open access: yesJournal of Mathematics, Volume 2024, Issue 1, 2024.
The main purpose of this paper is to introduce a new definition of JA‐module Arens regularity, which extends former standard definition. Then a new module structure on the semigroup algebra l1S as l1ES‐module with nontrivial right and left module actions is constructed.
Omid Pourbahri Rahpeyma   +3 more
wiley   +1 more source

On a Notion of Biflatness Related to a Closed Ideal

open access: yesJournal of Function Spaces, Volume 2024, Issue 1, 2024.
This study is motivated through the so‐called approximate homology results of Banach algebras arising from their closed ideals. For a Banach algebra A, the notion of approximate I‐biflatness is presented, where I is a closed ideal of A. Moreover, some related results between our concept of homology and the known notions of amenability in the setting of
Amir Sahami   +4 more
wiley   +1 more source

Monochromatic Sums and Products of Polynomials

open access: yesDiscrete Analysis
Monochromatic sums and products of polynomials, Discrete Analysis 2024:5, 7 pp. An early result in Ramsey theory, Schur's theorem, states that if the positive integers are finitely coloured, then there will always be $x$ and $y$ such that $x,y$ and $x ...
Ryan Alweiss
doaj   +1 more source

A topological approach to inverse and regular semigroups

open access: yes, 2003
Work of Ehresmann and Schein shows that an inverse semigroup can be viewed as a groupoid with an order structure; this approach was generalized by Nambooripad to apply to arbitrary regular semigroups.
B. Steinberg
semanticscholar   +1 more source

Topological Additively Representable Semigroups

open access: yes, 1997
We analyze the structure of nontrivial totally ordered connected topological semigroups ( S , +, ≲), and prove that they are homeomorphic, algebraically isomorphic, and isotonic to one of the following continua: (( a , ∞), +, ≤), ([ a , ∞), +, ≤), ( a  ≥ 
J. Candeal, J. Miguel, E. Induráin
semanticscholar   +1 more source

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