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Displaying 81 – 100 of 524

Bad Wadge-like reducibilities on the Baire space

Luca Motto Ros (2014)

Fundamenta Mathematicae

We consider various collections of functions from the Baire space $^{ω} ω$ into itself naturally arising in (effective) descriptive set theory and general topology, including computable (equivalently, recursive) functions, contraction mappings, and functions which are nonexpansive or Lipschitz with respect to suitable complete ultrametrics on $^{ω} ω$ (compatible with its standard topology). We analyze the degree-structures induced by such sets of functions when used as reducibility notions between subsets of...

Baire functions and classes bounded by filters

Miroslav Katětov (1975)

Commentationes Mathematicae Universitatis Carolinae

Bijections of scattered spaces onto compact Hausdorff

Władysław Kulpa, Marian Turzański (1988)

Acta Universitatis Carolinae. Mathematica et Physica

Bi-quotient images of ordered spaces.

Kočinac, Lj. (1986)

Publications de l'Institut Mathématique. Nouvelle Série

Booleanization

B. Banaschewski, A. Pultr (1996)

Cahiers de Topologie et Géométrie Différentielle Catégoriques

Booleanization of uniform frames

Bernhard Banaschewski, Aleš Pultr (1996)

Commentationes Mathematicae Universitatis Carolinae

Booleanization of frames or uniform frames, which is not functorial under the basic choice of morphisms, becomes functorial in the categories with weakly open homomorphisms or weakly open uniform homomorphisms. Then, the construction becomes a reflection. In the uniform case, moreover, it also has a left adjoint. In connection with this, certain dual equivalences concerning uniform spaces and uniform frames arise.

C-closed functions

G. L. Garg, B. Kumar (1989)

Matematički Vesnik

Chain of dendrites openly unbounded from below.

Opěla, David, Pyrih, Pavel, Šámal, Robert (2001)

Mathematica Pannonica

Chain of dendrites without open infimum.

Podbrdský, Pavel, Pyrih, Pavel (2002)

Southwest Journal of Pure and Applied Mathematics [electronic only]

Chain of dendrites without open supremum.

Podbrdský, Pavel, Pyrih, Pavel (2001)

Mathematica Pannonica

Chain of dendrites without retract infimum.

Podbrdskÿ, Pavel, Pyrih, Pavel (2002)

Mathematica Pannonica

Characterizations of Sn-metrizable Spaces

Ying Ge (2003)

Publications de l'Institut Mathématique

Characterizations of some near-continuous functions and near-open functions.

Baker, C.W. (1986)

International Journal of Mathematics and Mathematical Sciences

Characterizations of $z$ -Lindelöf spaces

Ahmad Al-Omari, Takashi Noiri (2017)

Archivum Mathematicum

A topological space $(X, τ)$ is said to be $z$ -Lindelöf [1] if every cover of $X$ by cozero sets of $(X, τ)$ admits a countable subcover. In this paper, we obtain new characterizations and preservation theorems of $z$ -Lindelöf spaces.

Classification of weakly infinite-dimensional spaces. Part II: Essential mappings

Piet Borst (1988)

Fundamenta Mathematicae

Cleavability and divisibility over developable spaces

Filippo Cammaroto (1996)

Commentationes Mathematicae Universitatis Carolinae

Some results on cleavability theory are presented. We also show some new [16]'s results.

Currently displaying 81 – 100 of 524

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Displaying 81 – 100 of 524

Bad Wadge-like reducibilities on the Baire space

Baire functions and classes bounded by filters

Bijections of scattered spaces onto compact Hausdorff

Bi-quotient images of ordered spaces.

Booleanization

Booleanization of uniform frames

C-closed functions

Chain of dendrites openly unbounded from below.

Chain of dendrites without open infimum.

Chain of dendrites without open supremum.

Chain of dendrites without retract infimum.

Characterizations of Sn-metrizable Spaces

Characterizations of some near-continuous functions and near-open functions.

Characterizations of $z$ -Lindelöf spaces

Classification of weakly infinite-dimensional spaces. Part II: Essential mappings

Cleavability and divisibility over developable spaces

...-Closed Mappings.

Closed mappings and local dimension

Closed mappings and the Freudenthal compactification

Closed mappings are open at a $G_{δ}$ set

Currently displaying 81 – 100 of 524