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Almost disjoint families and property (a)

Paul Szeptycki, Jerry Vaughan (1998)

Fundamenta Mathematicae

We consider the question: when does a Ψ-space satisfy property (a)? We show that if $| A | < p$ then the Ψ-space Ψ(A) satisfies property (a), but in some Cohen models the negation of CH holds and every uncountable Ψ-space fails to satisfy property (a). We also show that in a model of Fleissner and Miller there exists a Ψ-space of cardinality $p$ which has property (a). We extend a theorem of Matveev relating the existence of certain closed discrete subsets with the failure of property (a).

Almost every function is independent

Jan Mycielski (1973)

Fundamenta Mathematicae

Almost fixed points of semigroups of non-expansive mappings

R. Holmes, Anthony To-Ming Lau (1972)

Studia Mathematica

Almost ${\tilde{g}}_{α}$ -closed functions and separation axioms

O. Ravi, S. Ganesan, R. Latha (2012)

Mathematica Bohemica

We introduce a new class of functions called almost ${\tilde{g}}_{α}$ -closed and use the functions to improve several preservation theorems of normality and regularity and also their generalizations. The main result of the paper is that normality and weak normality are preserved under almost ${\tilde{g}}_{α}$ -closed continuous surjections.

Almost locatedness in uniform spaces

Douglas Bridges, Hajime Ishihara, Ray Mines, Fred Richman, Peter Schuster, Luminiţa Vîţă (2007)

Czechoslovak Mathematical Journal

A weak form of the constructively important notion of locatedness is lifted from the context of a metric space to that of a uniform space. Certain fundamental results about almost located and totally bounded sets are then proved.

Almost lower semicontinuous multifunctions and the Souslin-graph theorem

Marek Wilhelm (1982)

Commentationes Mathematicae Universitatis Carolinae

Almost maximal ideals

P. Johnstone (1984)

Fundamenta Mathematicae

Almost maximal topologies on groups

Yevhen Zelenyuk (2016)

Fundamenta Mathematicae

Let G be a countably infinite group. We show that for every finite absolute coretract S, there is a regular left invariant topology on G whose ultrafilter semigroup is isomorphic to S. As consequences we prove that (1) there is a right maximal idempotent in βG∖G which is not strongly right maximal, and (2) for each combination of the properties of being extremally disconnected, irresolvable, and nodec, except for the combination (-,-,+), there is a corresponding regular almost maximal left invariant...

Almost Menger and related spaces

Darko Kocev (2009)

Matematički Vesnik

Almost metric versions of Zhong's variational principle

Mihai Turinici (2013)

Matematički Vesnik

Almost midconvex and almost convex set-valued functions

Elżbieta Sadowska (2000)

Mathematica Slovaca

Almost nearly continuous multifunctions.

Ekici, E. (2004)

Acta Mathematica Universitatis Comenianae. New Series

Almost orthogonality and Hausdorff interval topologies of atomic lattice effect algebras

Jan Paseka, Zdena Riečanová, Junde Wu (2010)

Kybernetika

We prove that the interval topology of an Archimedean atomic lattice effect algebra $E$ is Hausdorff whenever the set of all atoms of $E$ is almost orthogonal. In such a case $E$ is order continuous. If moreover $E$ is complete then order convergence of nets of elements of $E$ is topological and hence it coincides with convergence in the order topology and this topology is compact Hausdorff compatible with a uniformity induced by a separating function family on $E$ corresponding to compact and cocompact elements....

We provide a new generalization of realcompactness based on ultrafilters of cozero sets and contrast it with almost realcompactness.

Currently displaying 901 – 920 of 8494

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Displaying 901 – 920 of 8494

Almost disjoint families and property (a)

Almost every function is independent

Almost fixed points of semigroups of non-expansive mappings

Almost ${\tilde{g}}_{α}$ -closed functions and separation axioms

Almost locatedness in uniform spaces

Almost lower semicontinuous multifunctions and the Souslin-graph theorem

Almost maximal ideals

Almost maximal topologies on groups

Almost Menger and related spaces

Almost metric versions of Zhong's variational principle

Almost midconvex and almost convex set-valued functions

Almost nearly continuous multifunctions.

Almost orthogonality and Hausdorff interval topologies of atomic lattice effect algebras

Almost periodic motion in complete space.

Almost quasicontinuity of multivalued maps on product spaces

Almost $^{*}$ realcompactness

Almost $γ$ -continuous functions.

Almost $δ$ -precontinuous multifunctions.

Almost-continuous path connected spaces.

Almost-Homeomorphisms And Almost-Topological Properties.

Currently displaying 901 – 920 of 8494