Geodesic
On the Cardinality of Urysohn Spaces
Canadian mathematical bulletin, Tome 31 (1988) no. 2, pp. 153-158

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In this paper some cardinal inequalities for Urysohn spaces are established. In particular the following two theorems are proved:(i)If where [A]θ denotes the θ-closed hull of A, i.e., the smallest θ-closed subset of X containing A;(ii), where aL(X, X) is the smallest cardinal number m such that for every open cover of X there is a subfamily for which
DOI : 10.4153/CMB-1988-023-4
Mots-clés : Cardinal functions, θ-closed sets, almost Lindelöf degree, Primary, 54A25, Secondary, 54D20 
Bella, A.; Cammaroto, F. On the Cardinality of Urysohn Spaces. Canadian mathematical bulletin, Tome 31 (1988) no. 2, pp. 153-158. doi: 10.4153/CMB-1988-023-4
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     title = {On the {Cardinality} of {Urysohn} {Spaces}},
     journal = {Canadian mathematical bulletin},
     pages = {153--158},
     year = {1988},
     volume = {31},
     number = {2},
     doi = {10.4153/CMB-1988-023-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1988-023-4/}
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