Arhangelskii, A.V.(Universitat Politècnica de València, 2000-10-01)
[EN] A (binary) product operation on a topological space X is considered. The only restrictions are that some element e of X is a left and a right identity with respect to this multiplication, and that certain natural ...
Iurato, Giuseppe(Universitat Politècnica de València, 2012-04-01)
[EN] The new topological concept of selective separability is able to give some estimates for density and π-weight of the Lebesgue space Lp(βN,R, μ) with 1 ≤ p < +∞. In particular, we deduce a purely topological proof of ...
Guirao Sánchez, Antonio José; Lissitsin, A.; Montesinos Santalucia, Vicente(Elsevier, 2019-11-01)
[EN] A Banach space X has the so-called ball-covering property whenever its unit sphere can be covered by a countable collection of open balls that miss the origin. If 0 < alpha < 1, then X has the alpha-ball covering ...