Results 81 to 90 of about 365 (176)

How Brazil embraced informal organizations. [PDF]

Int Polit (Hague), 2022
Stuenkel O.
europepmc   +1 more source

Transversal and T1-independent topologies and the Alexandroff duplicate

, 2012
Two T1-topologies on a given set are called transversal if their union is a subbase for the discrete topology, and T1-independent if their intersection is the cofinite topology.
M. Tkachenko, Tkachenko, M., Błaszczyk, A., A. Błaszczyk   +3 more
core   +1 more source

A Short Study of Alexandroff Spaces

, 2007
In this paper, we discuss the basic properties of Alexandroff spaces. Several examples of Alexandroff spaces are given. We show how to construct new Alexandroff spaces from given ones. Finally, two invariants for compact Alexandroff spaces are defined and calculated for the given examples.
openaire   +2 more sources

Orders, Alexandroff spaces and digraphs

, 2021
This thesis mainly deals with Alexandroff spaces which are related to some concepts like preorders, graphs and digraphs.The first chapter gives some basic notions about topology, order and minimal open sets, which are used in the next chapter.In the second chapter, Alexandroff spaces are defined by using minimal open sets, and definitions of preorder ...
openaire   +1 more source

Possible heights of Alexandroff square transformation groups

, 2018
In the following text we compute possible heights of $\mathbb A$ (Alexandroff square), $\mathbb O$ (unit square $[0,1]\times[0,1]$ with lexicographic order topology) and $\mathbb U$ (unit square $[0,1]\times[0,1]$ with induced topology of Euclidean plane)
Ebrahimifar, Fatemeh, Yahyaoghli, Hamed, Yaghmaeian, Reza, Shirazi, Fatemah Ayatollah Zadeh   +3 more
core  

La noción de variedad en la clase de espacios de Alexandroff. Superficies cerradas y espacios finitos. [PDF]

, 2020
Digital topology deals with topological features of 2-D and 3-D digital imagery. Digital images can be represented on a meshed plane or space by means of pixels (2-D) and voxels (3-D), so that they can be managed by using graphs where pixels/voxels are
Barrena Lara, Antonio
core  

Conley-Morse-Forman theory for generalized combinatorial multivector fields on finite topological spaces. [PDF]

J Appl Comput Topol, 2023
Lipiński M, Kubica J, Mrozek M, Wanner T.   +3 more
europepmc   +1 more source

Algebras, Graphs and Ordered Sets - ALGOS 2020 & the Mathematical Contributions of Maurice Pouzet. [PDF]

Order (Dordr), 2023
Couceiro M, Duffus D.
europepmc   +1 more source

Possible Heights of Alexandroff Square Transformation Groups

, 2020
In the following text we compute possible heights of A (Alexandroff square), O (unit square [0, 1] × [0, 1] with lexicographic order topology) and U (unit square [0, 1] × [0, 1] with induced topology of Euclidean plane). We prove Ph(A) = {n :
Fatemah Ayatollah Zadeh Shirazi; Faculty of Mathematics, Statistics and Computer Science, College of Science, University of Tehran, Enghelab Ave., Tehran, Iran, Reza Yaghmaeian; Faculty of Mathematics, Statistics and Computer Science, College of Science, University of Tehran, Enghelab Ave., Tehran, Iran, Fatemeh Ebrahimifar; Faculty of Mathematics, Statistics and Computer Science, College of Science, University of Tehran , Enghelab Ave., Tehran, Iran, Hamed Yahyaoghli; Department of Mathematics, Tarbiat Modares University, Modiriat Bridge, Tehran, Iran   +3 more
core  

A normal first countable ccc nonseparable space

, 1979
We construct an absolute example of a space having the properties in the title. Let Y be the set of nonempty finite subsets of the Cantor cube of countable weight. The Pixley-Roy topology on Y is not normal, but the Vietoris topology on Y is normal.
Murray G. Bell
core   +1 more source