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We introduce the $\ell^1$-ideal intersection property for crossed product C*-algebras. It is implied by C*-simplicity as well as C*-uniqueness. We show that topological dynamical systems of arbitrary lattices in connected Lie groups,…

Operator Algebras · Mathematics 2026-01-14 Are Austad , Sven Raum

A twisted commutative algebra is (for us) a commutative $\mathbf{Q}$-algebra equipped with an action of the infinite general linear group. In such algebras the "$\mathbf{GL}$-prime" ideals assume the duties fulfilled by prime ideals in…

Commutative Algebra · Mathematics 2020-02-05 Andrew Snowden

We study well-rounded ideal lattices from totally definite quaternion algebras. We prove existence and classification results, and illustrate our methods with examples.

Rings and Algebras · Mathematics 2025-12-04 Yuan Xiang Chew , Frédérique Oggier

In this study, we present the generalization of the concept of $r$-ideals in commutative rings with nonzero identity. Let $R$ be a commutative ring with $0\neq1$ and $L(R)$ be the lattice of all ideals of $R$. Suppose that…

Commutative Algebra · Mathematics 2020-06-23 Emel Aslankarayigit Ugurlu

In this paper, we introduce near perfect ideals and upper bounded ideals, and study them as well as perfect ideals for finite dimensional Lie algebras. We show that the largest perfect ideal and the largest near perfect ideal of a finite…

Rings and Algebras · Mathematics 2019-09-11 Liqun Qi

We give a vertex set description for basic, graded, regular ideals of locally-convex Kumjian-Pask Algebras. We also show that Condition (B) is preserved when taking the quotient by a basic, graded, regular ideal. We further show that when a…

Operator Algebras · Mathematics 2021-07-19 Timothy Schenkel

Inner ideals of simple locally finite dimensional Lie algebras over an algebraically closed field of characteristic 0 are described. In particular, it is shown that a simple locally finite dimensional Lie algebra has a non-zero proper inner…

Representation Theory · Mathematics 2013-01-29 Alexander Baranov , Jamie Rowley

We provide an algorithm that, given any order $O$ in a quaternion algebra over a global field, computes representatives of all right equivalence classes of right $O$-ideals, including the non-invertible ones. The theory is developed for a…

Number Theory · Mathematics 2025-02-28 Stefano Marseglia , Harry Smit

We define a Riesz type interpolation property for the Cuntz semigroup of a $C^*$-algebra and prove it is satisfied by the Cuntz semigroup of every $C^*$-algebra with the ideal property. Related to this, we obtain two characterizations of…

Operator Algebras · Mathematics 2011-09-14 Cornel Pasnicu , Francesc Perera

In this paper, we introduce the concept of f-ideals and discuss its algebraic properties. In particular, we give the characterization of all the f-ideals of degree 2.

Commutative Algebra · Mathematics 2015-03-17 G. Q. Abbasi , Sarfraz Ahmad , Imran Anwar , Waqas A. Baig

In this paper we obtain some statements concerning ideals of polynomials and apply these results in a number of different situations. Among other results, we present new characterizations of $\mathcal{L}_{\infty}$-spaces, Coincidence…

Functional Analysis · Mathematics 2007-05-23 Daniel M. Pellegrino

The main purpose of this paper is a wide generalization of one of the results abstract algebraic geometry begins with, namely of the fact that the prime spectrum $\mathrm{Spec}(R)$ of a unital commutative ring $R$ is always a spectral…

Category Theory · Mathematics 2021-12-02 Alberto Facchini , Carmelo Antonio Finocchiaro , George Janelidze

The geometric and algebraic theory of monomial ideals and multigraded modules is initiated over real-exponent polynomial rings and, more generally, monoid algebras for real polyhedral cones. The main results include the generalization of…

Commutative Algebra · Mathematics 2025-11-11 Ezra Miller

This paper presents a unified framework for determining the congruences on a number of monoids and categories of transformations, diagrams, matrices and braids, and on all their ideals. The key theoretical advances present an iterative…

Group Theory · Mathematics 2020-05-26 James East , Nik Ruskuc

In this work, we introduce a new class of Leibniz algebras, called quasi-Artinian Leibniz algebras, which generalizes the minimal condition on ideals. Furthermore, we provide some characterizations and give conditions under which a…

Rings and Algebras · Mathematics 2026-05-29 Calvin Tcheka , Guy R. Biyogmam , Bell Bogmis N. , Batkam Mbatchou V. Jacky

A sumset semigroup is a non-cancellative commutative monoid obtained from the sumset of finite non-negative integer sets. In this work, an algorithm for computing the ideals associated with some sumset semigroups is provided. Using these…

Number Theory · Mathematics 2021-10-06 J. I. García-García , D. Marín-Aragón , A. Vigneron-Tenorio

We determine the primitive ideal space and hence the ideal lattice of a large class of separable groupoid C*-algebras that includes all 2-graph C*-algebras. A key ingredient is the notion of harmonious families of bisections in etale…

Operator Algebras · Mathematics 2023-12-19 Kevin Aguyar Brix , Toke Meier Carlsen , Aidan Sims

A basic finite dimensional algebra over an algebraically closed field $k$ is isomorphic to a quotient of a tensor algebra by an admissible ideal. The category of left modules over the algebra is isomorphic to the category of representations…

Representation Theory · Mathematics 2011-02-08 Carl Fredrik Berg

This paper concerns the notion of a symmetric algebra and its generalization to a quasi-symmetric algebra. We study the structure of these algebras in respect to their hull-kernel regularity and existence of some ideals, especially the…

Functional Analysis · Mathematics 2017-06-29 Olufemi O. Oyadare

A set of meet-irreducible ideals is described for a class of maximal triangular almost finite algebras. This set forms a topological space under the hull-kernel closure, and there is a one-to-one correspondence between closed sets in this…

funct-an · Mathematics 2008-02-03 Michael P. Lamoureux