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arxiv: 1206.6555 · v2 · pith:7CHIZI42new · submitted 2012-06-28 · 🧮 math.GN

Cardinal functions F_(θ)(X) and t_(θ)(X) for H-closed spaces

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keywords thetah-closedspacescammarotocardinalfunctionsinacspace
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In this article, starting with results from a paper by Cammaroto and Ko\v{c}inac in 1993, we prove that $t_{\theta}(X) = t_{\theta}(X_{s}) = t(X_{s}) = F_{\theta}(X) = F_{\theta}(X_{s}) = F(X_{s})$ for every H-closed and Urysohn space and we present some useful examples to study the full relationships among the cardinal functions $t$, $t_{\theta}$, $F$ and $F_{\theta}$ in the context of H-closed and Urysohn spaces. Also, we construct an H-closed space $H$ for which $F_{\theta}(H) < t_{\theta}(H)$. Two questions posed by Cammaroto and Ko\v{c}inac about H-closed spaces are answered.

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