Banak, Taras; Guran, Igor; Ravsky, Alex(Universitat Politècnica de València, 2011-04-01)
[EN] We prove that a Hausdorff paratopological group G is meager if andonly if there are a nowhere dense subset A G and a countable setC G such that CA = G = AC.
Banak, Taras; Zdomskyi, Lubomyr(Universitat Politècnica de València, 2004-04-01)
[EN] In this paper we introduce and study three new cardinal topological invariants called the cs∗-, cs-, and sb-characters. The class of topological spaces with countable cs∗-character is closed under many topological ...