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On subcompactness and countable subcompactness of metrizable spaces in ZF
- 摘要：
- We show in ZF that: (i) Every subcompact metrizable space is completely metrizable, and every comple...
- doi：
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10.14712/1213-7243.2022.018
- 作 者：
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Kyriakos Keremedis
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- 期刊标题：
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Commentationes mathematicae Universitatis Carolinae
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Some isomorphic properties in projective tensor products
- 摘要：
- We give sufficient conditions implying that the projective tensor product of two Banach spaces X and...
- doi：
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10.14712/1213-7243.2023.008
- 作 者：
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Ioana Ghenciu
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- 期刊标题：
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Commentationes mathematicae Universitatis Carolinae
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Hyperspace selections avoiding points
- 摘要：
- We deal with a hyperspace selection problem in the setting of connected spaces. We present two solut...
- doi：
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10.14712/1213-7243.2022.026
- 作 者：
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Valentin Gutev
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- 期刊标题：
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Commentationes mathematicae Universitatis Carolinae
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Mersenne numbers as a difference of two Lucas numbers
- 摘要：
- Let (L_n)_{n\geq 0} be the Lucas sequence. We show that the Diophantine equation L_n-L_m=M_k has onl...
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10.14712/1213-7243.2022.027
- 作 者：
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Murat Alan
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- 期刊标题：
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Commentationes mathematicae Universitatis Carolinae
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On Szymański theorem on hereditary normality of \beta\omega
- 摘要：
- We discuss the following result of A. Szyma艅ski in ``Retracts and non-normality points" (2012), Coro...
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10.14712/1213-7243.2023.011
- 作 者：
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Sergei Logunov
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- 期刊标题：
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Commentationes mathematicae Universitatis Carolinae
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On Beurling measure algebras
- 摘要：
- We show how the measure theory of regular compacted-Borel measures defined on the \delta-ring of com...
- doi：
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10.14712/1213-7243.2022.016
- 作 者：
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Ross Stokke
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- 期刊标题：
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Commentationes mathematicae Universitatis Carolinae
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On Leibniz algebras with maximal cyclic subalgebras
- 摘要：
- We begin to study the structure of Leibniz algebras having maximal cyclic subalgebras.
- doi：
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10.14712/1213-7243.2023.001
- 作 者：
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Vasiliy A. Chupordia...
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- 期刊标题：
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Commentationes mathematicae Universitatis Carolinae
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The category of compactifications and its coreflections
- 摘要：
- We define ``the category of compactifications", which is denoted {\bf{CM}}, and consider its family ...
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10.14712/1213-7243.2022.024
- 作 者：
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Anthony W. Hager ; B...
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- 期刊标题：
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Commentationes mathematicae Universitatis Carolinae
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The common division topology on N
- 摘要：
- A topological space X is totally Brown if for each n \in \mathbb{N} \setminus \{1\} and every nonemp...
- doi：
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10.14712/1213-7243.2022.022
- 作 者：
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José del Carmen Albe...
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- 期刊编号：
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- 期刊标题：
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Commentationes mathematicae Universitatis Carolinae
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Order intervals in C(K). Compactness, coincidence of topologies, metrizability
- 摘要：
- Let K be a compact space and let C(K) be the Banach lattice of real-valued continuous functions on K...
- doi：
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10.14712/1213-7243.2022.006
- 作 者：
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Zbigniew Lipecki
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- 期刊编号：
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- 期刊标题：
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Commentationes mathematicae Universitatis Carolinae
