Geodesic
On the cardinality of Hausdorff spaces
Commentationes Mathematicae Universitatis Carolinae, Tome 39 (1998) no. 3, pp. 581-585.

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The aim of this paper is to show, using the reflection principle, three new cardinal inequalities. These results improve some well-known bounds on the cardinality of Hausdorff spaces.
Classification : 54A25
Keywords: cardinal inequality; Hausdorff space 
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     title = {On the cardinality of {Hausdorff} spaces},
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Fedeli, Alessandro. On the cardinality of Hausdorff spaces. Commentationes Mathematicae Universitatis Carolinae, Tome 39 (1998) no. 3, pp. 581-585. http://geodesic.mathdoc.fr/item/CMUC_1998__39_3_a13/