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- W2328877237 abstract "AbstractThis article extends the results proved by Cammaroto and Kočinac in 1993 by showing that tθ(X) = tθ(Xs) = t(Xs) = Fθ(X) = Fθ(Xs) = F(Xs) for every H-closed and Urysohn space. Examples are developed to study all of the relationships among the cardinal functions t, tθ, F and Fθ in the context of H-closed and Urysohn spaces. Also, an H-closed space H is constructed for which Fθ(H) < tθ(H). Two questions posed by Cammaroto and Kočinac about H-closed spaces are completely answered.Mathematics Subject Classification (2010): 54A2554D1054D2554D3554G20Key words: Closureθ-closurefree sequenceθ-free sequencet(X)tθ(X)F(X)Fθ(X)compact spacesH-closed spacesUrysohn spaces" @default.
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- W2328877237 date "2014-03-14" @default.
- W2328877237 modified "2023-10-05" @default.
- W2328877237 title "Cardinal functions<i>F</i><sub><i>θ</i></sub>(<i>X</i>) and<i>t</i><sub><i>θ</i></sub>(<i>X</i>) for H-closed spaces" @default.
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- W2328877237 doi "https://doi.org/10.2989/16073606.2013.779783" @default.
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