Representations of commutative semigroups by products of metric -dimensional spaces
Previous Page 3
Jiří Vinárek (1982)
Commentationes Mathematicae Universitatis Carolinae
Jiří Vinárek (1980)
Commentationes Mathematicae Universitatis Carolinae
Miroslav Ploščica (2000)
Colloquium Mathematicae
We investigate the congruence lattices of lattices in the varieties . Our approach is to represent congruences by open sets of suitable topological spaces. We introduce some special separation properties and show that for different n the lattices in have different congruence lattices.
Věra Trnková (1988)
Cahiers de Topologie et Géométrie Différentielle Catégoriques
Harold Bennett, Dennis Burke, David Lutzer (2012)
Fundamenta Mathematicae
A rotoid is a space X with a special point e ∈ X and a homeomorphism F: X² → X² having F(x,x) = (x,e) and F(e,x) = (e,x) for every x ∈ X. If any point of X can be used as the point e, then X is called a strong rotoid. We study some general properties of rotoids and prove that the Sorgenfrey line is a strong rotoid, thereby answering several questions posed by A. V. Arhangel'skii, and we pose further questions.
H. Priestley (1974)
Fundamenta Mathematicae
Fabel, Paul (2005)
Algebraic & Geometric Topology
Joaquín M.ª Ortega Aramburu (1975)
Collectanea Mathematica
Adam Grabowski (2014)
Formalized Mathematics
Rough sets, developed by Pawlak, are an important model of incomplete or partially known information. In this article, which is essentially a continuation of [11], we characterize rough sets in terms of topological closure and interior, as the approximations have the properties of the Kuratowski operators. We decided to merge topological spaces with tolerance approximation spaces. As a testbed for our developed approach, we restated the results of Isomichi [13] (formalized in Mizar in [14]) and...
Trnková, Věra (2003)
Acta Mathematica Universitatis Comenianae. New Series
Klaus Keimel, Gerhard Gierz (1976)
Mathematische Zeitschrift
Ivan Kulich (1985)
Mathematica Slovaca
Gabriele Darbo (1978)
Rendiconti del Seminario Matematico della Università di Padova
Josef Dorfmeister (1975)
Mathematische Annalen
В.В. Федорчук (1973)
Sibirskij matematiceskij zurnal
Andrey V. Koldunov (1987)
Czechoslovak Mathematical Journal
В.В. Пашенков (1973)
Matematiceskij sbornik
Previous Page 3