Zobrazeno 1 - 10
of 35
pro vyhledávání: '"Lev Bukovský"'
Autor:
Lev, Bukovský
Publikováno v:
Advanced Topics of Topology ISBN: 9781803550930
Advanced Topics of Topology
Advanced Topics of Topology
We present results on the relationships of the covering property GΦΨ for Φ,Ψ∈OΛΩΓ and G∈S1SfinUfin of a topological space and the selection property GΦ0Ψ0 of the corresponding family of real functions. The result already published are pr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::11229f1d3c776ede7bb447b94fa0a6ea
https://doi.org/10.5772/intechopen.100555
https://doi.org/10.5772/intechopen.100555
Autor:
Lev Bukovský
Publikováno v:
Topology and its Applications. 258:239-250
O , Ω and Γ denotes the family of all open, open ω- and open γ-covers of a topological space X, respectively. O s h , Ω s h and Γ s h denotes the corresponding families of shrinkable covers. Let Ψ be one of the symbols O , Ω or Γ. We introdu
Publikováno v:
Commentationes Mathematicae Universitatis Carolinae. 59:415-421
Autor:
Lev Bukovský
Publikováno v:
Topology and its Applications. 304:107787
Let X be a set and A ⊆ P ( X ) be a family closed under finite intersections such that ∅ , X ∈ A . If ψ = o , ω , γ , then Ψ ( A ) is the family of those ψ-covers U for which U ⊆ A . In [3] , properties ( Ψ 0 ) of a family F ⊆ X R of
Autor:
Lev Bukovský
Publikováno v:
Commentationes Mathematicae Universitatis Carolinae. 58:347-358
The paper contains a self-contained alternative proof of my Theorem in Characterization of generic extensions of models of set theory, Fund. Math. 83 (1973), 35--46, saying that for models $M\subseteq N$ of ZFC with same ordinals, the condition $Apr_
Publikováno v:
Colloquium Mathematicum. 146:265-281
Recently the author and D. Chandra began to study the notion of an ideal quasi-normal convergence and some topological notions defined by this convergence. We show that several properties of so introduced notions depend on the ideal and sometimes, th
Autor:
Alexander V. Osipov, Lev Bukovský
Publikováno v:
Topol. Appl.
Topology and its Applications
Topology and its Applications
Let $USC^*_p(X)$ be the topological space of real upper semicontinuous bounded functions defined on $X$ with the subspace topology of the product topology on ${}^X\mathbb{R}$. $\tilde\Phi^{\uparrow},\tilde\Psi^{\uparrow}$ are the sets of all upper se
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d137144bf78493913c9d3f1e92a45fd3
http://arxiv.org/abs/1905.10287
http://arxiv.org/abs/1905.10287
Autor:
Jaroslav Šupina, Lev Bukovský
Publikováno v:
Topology and its Applications. 160:2356-2370
We study modifications of the sequence selection principles for real functions obtained by allowing other than continuous functions and/or by replacing the pointwise convergence by quasi-normal or discrete convergence. We show that for important fami
Autor:
Lev Bukovský
Publikováno v:
Topology and its Applications. 156:24-27
Several properties of a topological space related to the behavior of open coverings or to the behavior of sequences of continuous real-valued functions defined on the space were recently studied. We modify some notions replacing continuous functions
Autor:
Jozef Haleš, Lev Bukovský
Publikováno v:
Topology and its Applications. 154:848-858
The main results of the paper are as follows: covering characterizations of wQN-spaces, covering characterizations of QN-spaces and a theorem saying that Cp(X) has the Arkhangel'skiıˇ property (α1) provided that X is a QN-space. The latter stateme