Petrenko, Oleksandr; Protasov, Igor V.; Slobodianiuk, Sergii(Editorial Universitat Politècnica de València, 2014-10-01)
[EN] A ballean is a set X endowed with some family F of its subsets, called the balls, in such a way that (X,F) can be considered as an asymptotic counterpart of a uniform topological space. Given a cardinal k, we define ...
Bonanzinga, M.; Carlson, N.; Cuzzupè, M. V.; Stavrova, D.(Universitat Politècnica de València, 2018-10-04)
[EN] In this paper we continue to investigate the impact that various separation axioms and covering properties have onto the cardinality of topological spaces. Many authors have been working in that field. To mention a ...