Geodesic
The $G_\delta$-topology and incompactness of $\omega^\alpha$
Commentationes Mathematicae Universitatis Carolinae, Tome 37 (1996) no. 3, pp. 613-616.

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We establish a relation between covering properties (e.g\. Lindelöf degree) of two standard topological spaces (Lemmas 4 and 5). Some cardinal inequalities follow as easy corollaries.
Classification : 45B10, 54A25, 54D20
Keywords: Lindelöf degree; $G_\delta$ topology; cardinal functions 
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Gorelic, Isaac. The $G_\delta$-topology and incompactness of $\omega^\alpha$. Commentationes Mathematicae Universitatis Carolinae, Tome 37 (1996) no. 3, pp. 613-616. http://geodesic.mathdoc.fr/item/CMUC_1996__37_3_a17/