Results 31 to 40 of about 722,539 (348)

On some spaces via topological ideals

open access: yesOpen Mathematics, 2023
Our main purpose is to introduce and investigate the concepts of some forms of spaces via topological ideals. Some characterizations of some forms of spaces via topological ideals are established.
Boonpok Chawalit
doaj   +1 more source

Neutrosophic Nano Semi-Frontier [PDF]

open access: yesNeutrosophic Sets and Systems, 2020
Smarandache presented and built up the new idea of Neutrosophic set from the Intuition istic fuzzy sets. A.A. Salama presented Neutrosophic topological spaces by utilizing the Neutro sophic sets.
R. Vijayalakshmi, Mookambika A.P.
doaj   +1 more source

The topological fundamental group and free topological groups [PDF]

open access: yes, 2010
The topological fundamental group $\pi_{1}^{top}$ is a homotopy invariant finer than the usual fundamental group. It assigns to each space a quasitopological group and is discrete on spaces which admit universal covers.
Aguilar   +28 more
core   +2 more sources

Topological Up-Algebras

open access: yesDiscussiones Mathematicae - General Algebra and Applications, 2019
In this paper, we introduce the notion of topological UP-algebras and several types of subsets of topological UP-algebras, and prove the generalization of these subsets.
Satirad Akarachai, Iampan Aiyared
doaj   +1 more source

Modal Logic Axioms Valid in Quotient Spaces of Finite CW-Complexes and Other Families of Topological Spaces

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 2016
In this paper we consider the topological interpretations of L□, the classical logic extended by a “box” operator □ interpreted as interior. We present extensions of S4 that are sound over some families of topological spaces, including particular point ...
Maria Nogin, Bing Xu
doaj   +1 more source

Nearly Soft Menger Spaces

open access: yesJournal of Mathematics, 2020
In this paper, we define a weak type of soft Menger spaces, namely, nearly soft Menger spaces. We give their complete description using soft s-regular open covers and prove that they coincide with soft Menger spaces in the class of soft regular⋆ spaces ...
Tareq M. Al-shami   +1 more
doaj   +1 more source

$\mathcal{S}_X$-convergence and locally hypercompact spaces [PDF]

open access: yesarXiv, 2022
In this paper, we give a topological version of Scott convergence theorem for locally hypercompact spaces. We introduce the notion of $\mathcal{S}^*_X$-convergence on a $T_0$ topological space $X$, and define the notion of finitely approximated spaces. Monotone determined spaces are natural topological extensions of dcpos.
arxiv  

On the Weight of a Topological Space [PDF]

open access: yesProceedings of the American Mathematical Society, 1974
The main result in this paper states that the weight of a regular space is the product of three cardinal functions, namely the Lindelöf degree, the pluming degree, and the point separating weight.
openaire   +1 more source

The Rice-Shapiro theorem in Computable Topology

open access: yes, 2017
We provide requirements on effectively enumerable topological spaces which guarantee that the Rice-Shapiro theorem holds for the computable elements of these spaces.
Korovina, Margarita, Kudinov, Oleg
core   +1 more source

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