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We prove that every quasicontinuous domain that fails to be quasialgebraic admits the unit interval [0, 1] as its monotone Lawson-continuous image. As a result, every countable quasicontinuous domain is quasialgebraic.

General Topology · Mathematics 2025-10-31 Xiaoquan Xu

We introduce quasi-Prufer extensions of rings in order to relativize the notion of quasi-Prufer domains and to take into account some contexts recently introduced in the literature. We also introduce almost-Prufer ring extensions.…

Commutative Algebra · Mathematics 2016-11-01 Gabriel Picavet , Martine Picavet-L'Hermitte

We introduce the notion of extremal basis of tangent vector fields at a boundary point of finite type of a pseudo-convex domain in $\mathbb{C}^n$. Then we define the class of geometrically separated domains at a boundary point, and give a…

Complex Variables · Mathematics 2014-07-10 Philippe Charpentier , Yves Dupain

We prove that a Hilbert domain which is quasi-isometric to a normed vector space is actually a convex polytope.

Metric Geometry · Mathematics 2009-05-27 Bruno Colbois , Patrick Verovic

We study the class of domains in which each w-ideal is divisorial, extending several properties of divisorial and totally divisorial domains to a much wider class of domains. In particular we consider PvMDs and Mori domains.

Commutative Algebra · Mathematics 2007-05-23 Said El Baghdadi , Stefania Gabelli

This paper examines necessary and sufficient conditions for the uniqueness of dynamic Groves mechanisms when the domain of valuations is restricted. Our approach is to appropriately define the total valuation function, which is the expected…

Theoretical Economics · Economics 2021-07-09 Kiho Yoon

In this paper the question of which semigroups are realizable as the semigroup of values attained on a Noetherian local ring which is dominated by a valuation is considered. We give some striking examples, indicating that there may be no…

Algebraic Geometry · Mathematics 2007-08-02 Steven Dale Cutkosky , Bernard Teissier

We introduce a class of discrete dynamical systems that we call \emph{virtually expanding}. This is an open subset of self-covering maps on a closed manifold which contains all expanding maps and some partially hyperbolic volume-expanding…

Dynamical Systems · Mathematics 2022-11-08 Masato Tsujii

Quasi-abelian categories are abundant in functional analysis and representation theory. It is known that a quasi-abelian category $\mathcal{E}$ is a cotilting torsionfree class of an abelian category. In fact, this property characterizes…

Category Theory · Mathematics 2024-08-06 Ruben Henrard , Sondre Kvamme , Adam-Christiaan van Roosmalen , Sven-Ake Wegner

Analysis of nonlinear autonomous systems typically involves estimating domains of attraction, which have been a topic of extensive research interest for decades. Despite that, accurately estimating domains of attraction for nonlinear…

Systems and Control · Electrical Eng. & Systems 2025-06-18 Mohamed Serry , Haoyu Li , Ruikun Zhou , Huan Zhang , Jun Liu

The following result is proved: Let $D$ and $D'$ be bounded domains in $\mathbb C^n$, $\partial D$ is smooth, real-analytic, simply connected, and $\partial D'$ is connected, smooth, real-algebraic. Then there exists a proper holomorphic…

Complex Variables · Mathematics 2009-11-07 Rasul Shafikov

Given a non-negative, decreasing sequence $a$ with sum $1$, we consider all the closed subsets of $[0,1]$ such that the lengths of their complementary open intervals are given by the terms of $a$, the so-called complementary sets. In this…

Classical Analysis and ODEs · Mathematics 2019-03-20 Ignacio García , Kathryn E. Hare , Franklin Mendivil

The study of weak domains and quasicontinuous domains leads to the consideration of two types generalizations of domains. In the current paper, we define the weak way-below relation between two nonempty subsets of a poset and quasiexact…

General Topology · Mathematics 2023-06-22 Zhaorong He , Zhongqiang Yang , Dongsheng Zhao

We say that an $R$-module $M$ is {\it virtually simple} if $M\neq (0)$ and $N\cong M$ for every non-zero submodule $N$ of $M$, and {\it virtually semisimple} if each submodule of $M$ is isomorphic to a direct summand of $M$. We carry out a…

Rings and Algebras · Mathematics 2016-10-18 Mahmood Behboodi , Asghar Daneshvar , Mohammad Reza Vedadi

An integral domain is called {\em Globalized multiplicatively pinched-Dedekind domain $($GMPD domain$)$} if every nonzero non-invertible ideal can be written as $JP_1\cdots P_k$ with $J$ invertible ideal and $P_1,...,P_k$ distinct ideals…

Commutative Algebra · Mathematics 2020-02-14 Shafiq ur Rehman , Sehrish Bibi , Rubab Gull

Let D be a domain with quotient field K and A a D-algebra. We call a polynomial with coefficients in K that maps every element of A to an element of A "integer-valued on A". For commutative A we also consider integer-valued polynomials in…

Rings and Algebras · Mathematics 2013-06-11 Sophie Frisch

Let $F$ be a field, let $D$ be a local subring of $F$, and let Val$_F(D)$ be the space of valuation rings of $F$ that dominate $D$. We lift Zariski's connectedness theorem for fibers of a projective morphism to the Zariski-Riemann space of…

Commutative Algebra · Mathematics 2023-06-27 William Heinzer , K. Alan Loper , Bruce Olberding , Matt Toeniskoetter

Let E be an operator algebra on a Hilbert space with finite-dimensional generated C*-algebra. A classification is given of the locally finite algebras and the operator algebras obtained as limits of direct sums of matrix algebras over E…

Operator Algebras · Mathematics 2007-05-23 S. C. Power

We give a domain-theoretic semantics to a statistical programming language, using the plain old category of dcpos, in contrast to some more sophisticated recent proposals. Remarkably, our monad of minimal valuations is commutative, which…

Logic in Computer Science · Computer Science 2021-09-14 Jean Goubault-Larrecq , Xiaodong Jia , Clément Théron

In this paper, we discuss topological aspects of the space of valuations $\mathbb{V}$ and the valuative tree $\mathcal{T}(v,\Lambda)$. We present a relation between the weak tree topology and the Scott topology in $\mathcal{T}(v,\Lambda)$…

Commutative Algebra · Mathematics 2026-04-06 Vinicius Manfredini , Josnei Novacoski , Caio Henrique Silva de Souza