19 citations · 33 across the 15 of their papers we have counts for
23 papers
A common extension of Lindelöf, H-closed and ccc
Angelo Bella
The inequality has been proved to be true for Lindelöf spaces (Arhangel'ski\uı, 1969), -closed spaces (Dow-Porter, 1982) and ccc spaces (Hajnal-Juász 1967),…
Upper bounds for the tightness of the -topology
Angelo Bella, Santi Spadaro
We prove that if is a regular space with no uncountable free sequences, then the tightness of its topology is at most continuum and if is in addition Lindelöf then it…
On Cellular-Compact and related spaces
Angelo Bella
Tkachuk and Wilson proved that a regular first countable cellular-compact space has cardinality not exceeding the continuum. In the same paper they asked if this result continues t…
A common extension of Arhangel'skii's Theorem and the Hajnal-Juhasz inequality
Angelo Bella, Santi Spadaro
We present a bound for the weak Lindelöf number of the -modification of a Hausdorff space which implies various known cardinal inequalities, including the following two fundam…
Pseudoradial spaces and copies of
Angelo Bella, Alan Dow, Rodrigo Hernández-Gutiérrez
In this paper we compare the concepts of pseudoradial spaces and the recently defined strongly pseudoradial spaces in the realm of compact spaces. We show that $\mathrm{MA}+\mathfr…
On weakening tightness to weak tightness
Angelo Bella, Nathan Carlson
The weak tightness of a space was introduced in [11] with the property . We investigate several well-known results concerning and consider whethe…