Compact unions of closed subsets are closed and compact intersections of open subsets are open
Nachbin, Leopoldo (1992)
Portugaliae mathematica
Similarity:
Nachbin, Leopoldo (1992)
Portugaliae mathematica
Similarity:
Lucjan Szamkołowicz (1987)
Colloquium Mathematicae
Similarity:
Jie-Hua Mai, Song Shao (2007)
Fundamenta Mathematicae
Similarity:
Let (X,f) be a dynamical system. In general the set of all ω-limit sets of f is not closed in the hyperspace of closed subsets of X. In this paper we study the case when X is a graph, and show that the family of ω-limit sets of a graph map is closed with respect to the Hausdorff metric.
Gyula O.H. Katona, Ákos Kisvölcsey (2012)
Discussiones Mathematicae Graph Theory
Similarity:
A set system is called t-intersecting if every two members meet each other in at least t elements. Katona determined the minimum ratio of the shadow and the size of such families and showed that the Erdős-Ko-Rado theorem immediately follows from this result. The aim of this note is to reproduce the proof to obtain a slight improvement in the Kneser graph. We also give a brief overview of corresponding results.
Marián Sudolský (1978)
Mathematica Slovaca
Similarity:
David Phillips (1972)
Fundamenta Mathematicae
Similarity:
Don R. Lick (1976)
Colloquium Mathematicae
Similarity:
J. Nieminen (1975)
Applicationes Mathematicae
Similarity:
D. M. Cvetković (1975)
Matematički Vesnik
Similarity:
Baggs, Ivan (1989)
International Journal of Mathematics and Mathematical Sciences
Similarity: