Results 101 to 110 of about 254,909 (213)
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
The tiling C∗-algebra viewed as a tight inverse semigroup algebra [PDF]
, 2020 We realize Kellendonk´s C*-algebra of an aperiodic tiling as the tight C*-algebra of the inverse semigroup associated to the tiling, thus providing further evidence that the tight C*-algebra is a good candidate to be the natural associative algebra to go
Ruy Exel +2 more
core
Geometry of essential matrix ranges and the Smith–Ward problem for operator systems
Bulletin of the London Mathematical Society, Volume 58, Issue 9, September 2026.Abstract A d$d$‐tuple of bounded linear selfadjoint operators acting on an infinite‐dimensional separable Hilbert space is said to have the Smith–Ward property if the identity map of the image of the operator system in the Calkin algebra has a completely positive lift.
Douglas Farenick +2 more
wiley +1 more source
Cancellative and Malcev presentations for finite Rees index subsemigroups and extensions [PDF]
, 2008 It is known that, for semigroups, the property of admitting a finite presentation is preserved on passing to subsemigroups and extensions of finite Rees index.
Cain, Alan James +3 more
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The norm closed triple semigroup algebra [PDF]
, 2019 The w*-closed triple semigroup algebra was introduced by Power and the author in [21], where it was proved to be reflexive and to be chiral, in the sense of not being unitarily equivalent to its adjoint algebra.
Kastis, E.
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A Unary Semigroup Trace Algebra [PDF]
, 2020 The Unifying Theories of Programming (UTP) of Hoare and He promote the unification of semantics catering for different concerns, such as, termination, data modelling, concurrency and time. Process calculi like Open image in new window and CSP can be given semantics in the UTP using reactive designs whose traces can be abstractly specified using a ...
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Module Amenability for Semigroup Algebras [PDF]
Semigroup Forum, 2004 We extend the concept of amenability of a Banach algebra $A$ to the case that there is an extra $\mathfrak A$-module structure on $A$, and show that when $S$ is an inverse semigroup with subsemigroup $E$ of idempotents, then $A=\ell^1(S)$ as a Banach module over $\mathfrak A=\ell^1(E)$ is module amenable iff $S$ is amenable.
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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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, 2007 This paper aims to study the Smarandache cosets and derive some interesting results about them. We prove the classical Lagranges theorem for Smarandache semigroup is not true and that there does not exist a one-to-one correspondence between any two right
Vasantha Kandasamy, W.B.
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Module Amenability of Semigroup Algebras under Certain Module Actions
Journal of Mathematical Extension, 2014 In this paper we define a congruence ∼ on inverse semigroup S such that amenability of S is equivalent to amenability of S/ ∼. We study module amenability of semigroup algebra l 1 (S/ ∼) when S is an inverse semigroup with idempotents E and prove ...
A. Sahleh, S. Grailo Tanha
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