On locally expansive selfcoverings of compact metrizable spaces
Aleksander Całka (1983)
Fundamenta Mathematicae
Irmina Herburt, Maria Moszyńska (1991)
Colloquium Mathematicae
Witold Bula (1984)
Fundamenta Mathematicae
Ján Borsík, Jozef Doboš (1982)
Mathematica Slovaca
S. A. Peregudov (2000)
Commentationes Mathematicae Universitatis Carolinae
Some results concerning spaces with countably weakly uniform bases are generalized for spaces with -in-countable ones.
Mikhail Katz (1991)
Fundamenta Mathematicae
Sergei Logunov (2022)
Commentationes Mathematicae Universitatis Carolinae
Let a space be Tychonoff product of -many Tychonoff nonsingle point spaces . Let Suslin number of be strictly less than the cofinality of . Then we show that every point of remainder is a non-normality point of its Čech–Stone compactification . In particular, this is true if is either or and a cardinal is infinite and not countably cofinal.
Arosio, A., Ferreira, A.V. (1978)
Portugaliae mathematica
I. Althöfer (1988)
Discrete & computational geometry
Shu Hao Sun (1989)
Commentationes Mathematicae Universitatis Carolinae
P. Mankiewicz (1983)
Fundamenta Mathematicae
Horst Herrlich, Paul Howard, Kyriakos Keremedis (2016)
Commentationes Mathematicae Universitatis Carolinae
We show that given infinite sets and a function which is onto and -to-one for some , the preimage of any ultrafilter of under extends to an ultrafilter. We prove that the latter result is, in some sense, the best possible by constructing a permutation model with a set of atoms and a finite-to-one onto function such that for each free ultrafilter of its preimage under does not extend to an ultrafilter. In addition, we show that in there exists an ultrafilter compact pseudometric...
Attilio Le Donne (1977)
Rendiconti del Seminario Matematico della Università di Padova
Xun Ge (2009)
Matematički Vesnik
Nguyen Van Dung (2009)
Matematički Vesnik
Kiiti Morita (1975)
Fundamenta Mathematicae
Baidyanath Ray (1972)
Monatshefte für Mathematik
Roman Duda, Rastislav Telgársky (1968)
Czechoslovak Mathematical Journal
Karol Borsuk (1955)
Fundamenta Mathematicae
Borkowski, Marcin, Bugajewski, Dariusz, Phulara, Dev (2010)
Fixed Point Theory and Applications [electronic only]