Results 81 to 90 of about 652,533 (244)
Abstract Boundary Delay Systems and Application to Network Flow
Mathematical Methods in the Applied Sciences, Volume 49, Issue 1, Page 119-129, 15 January 2026.ABSTRACT This paper investigates the well‐posedness and positivity of solutions to a class of delayed transport equations on a network. The material flow is delayed at the vertices and along the edges. The problem is reformulated as an abstract boundary delay equation, and well‐posedness is proved by using the Staffans–Weiss theory.
András Bátkai +2 more
wiley +1 more source
Several co-associative laws and pre-$ B $-algebras
AIMS MathematicsIn this paper, we introduce several co-associative laws and the notion of a pre-$ B $-algebra. We show that every $ B $-algebra is both a pre-$ B $-algebra and a $ \perp $-algebra. We apply the notions of a post groupoid and a pre-semigroup of a groupoid
Siriluk Donganont +2 more
doaj +1 more source
Weak*-closed invariant subspaces and ideals of semigroup algebras on foundation semigroups [PDF]
Journal of Sciences, Islamic Republic of Iran, 2014 Let S be a locally compact foundation semigroup with identity and be its semigroup algebra. Let X be a weak*-closed left translation invariant subspace of In this paper, we prove that X is invariantly complemented in if ...
B. Mohammadzadeh
doaj
On Pseudo-contractibility and Ultra Central Approximate Identity of Some Semigroup Algebras
Journal of Mathematics, 2022 In this paper, we investigate the existence of an ultra central approximate identity for a Banach algebra A and its second dual A∗∗. Also, we prove that for a left cancellative regular semigroup S, ℓ1S∗∗ has an ultra central approximate identity if and ...
Amir Sahami, Seyedeh Fatemeh Shariati
doaj +1 more source
Infinite-dimensional Compact Quantum Semigroup
, 2011 In this paper we construct a compact quantum semigroup structure on the Toeplitz algebra $\mathcal{T}$. The existence of a subalgebra, isomorphic to the algebra of regular Borel's measures on a circle with convolution product, in the dual algebra ...
A. Clifford +9 more
core +1 more source
The Cuntz semigroup and the radius of comparison of the crossed product by a finite group [PDF]
Ergodic Theory and Dynamical Systems, 2019 Let G be a finite group, let A be an infinite-dimensional stably finite simple unital C*-algebra, and let $\alpha \colon G \to {\operatorname {Aut}} (A)$ be an action of G on A which has the weak tracial Rokhlin property.
M. A. Asadi-Vasfi +2 more
semanticscholar +1 more source
Semigroup C*-algebras of $ax+b$-semigroups
arXiv:1306.5553, 2013 We study semigroup C*-algebras of $ax+b$-semigroups over integral domains. The goal is to generalize several results about C*-algebras of $ax+b$-semigroups over rings of algebraic integers. We prove results concerning K-theory and structural properties like the ideal structure or pure infiniteness. Our methods allow us to treat $ax+b$-semigroups over a
openaire +3 more sources
When do pseudo‐Gorenstein rings become Gorenstein?
Bulletin of the London Mathematical Society, Volume 58, Issue 1, January 2026.Abstract We discuss the relationship between the trace ideal of the canonical module and pseudo‐Gorensteinness. In particular, under certain mild assumptions, we show that every positively graded domain that is both pseudo‐Gorenstein and nearly Gorenstein is Gorenstein. As an application, we clarify the relationships among nearly Gorensteinness, almost
Sora Miyashita
wiley +1 more source
THE ANALOGUE OF WEIGHTED GROUP ALGEBRA FOR SEMITOPOLOGICAL SEMIGROUPS [PDF]
Journal of Sciences, Islamic Republic of Iran, 1995 In [1,2,3], A. C. Baker and J.W. Baker studied the subspace Ma(S) of the convolution measure algebra M, (S) of a locally compact semigroup. H. Dzinotyiweyi in [5,7] considers an analogous measure space on a large class of C-distinguished topological ...
doaj
Semigroup C⁎-algebras and amenability of semigroups
Journal of Functional Analysis, 2012 39 pages; corrected and revised version, new construction added in section ...
openaire +3 more sources