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math.GN2017
Variations on known and recent cardinality bounds
Fortunata Aurora Basile, Maddalena Bonanzinga, Nathan Carlson
Sapirovskii [18] proved that , for a regular space . We introduce the -pseudocharacter of a Urysohn space , denoted by , and prove that th…
math.GN2017
On the weak tightness, Hausdorff spaces, and power homogeneous compacta
Nathan Carlson
Motivated by results of Juhász and van Mill in [13], we define the cardinal invariant , the weak tightness of a topological space , and show that $|X|\leq 2^{L(X)wt(X)ψ(X…