A. Bella

activity

20122020

most citedInfinite games and cardinal properties of topological spaces

4 citations · 4 across the 7 of their papers we have counts for

collaborators

Showing 2020Show all

2 papers · 1 filter

math.GN2020

A common extension of Lindelöf, H-closed and ccc

Angelo Bella

The inequality $∣ X ∣ \leq 2^{χ (X)}$ has been proved to be true for Lindelöf spaces (Arhangel'ski\uı, 1969), $H$ -closed spaces (Dow-Porter, 1982) and ccc spaces (Hajnal-Juász 1967),…

math.GN2020

Upper bounds for the tightness of the $G_{δ}$ -topology

Angelo Bella, Santi Spadaro

We prove that if $X$ is a regular space with no uncountable free sequences, then the tightness of its $G_{δ}$ topology is at most continuum and if $X$ is in addition Lindelöf then it…

A common extension of Lindelöf, H-closed and ccc

Upper bounds for the tightness of the Gδ​-topology

Upper bounds for the tightness of the $G_{δ}$ -topology