Geodesic
On subsets of Alexandroff duplicates
Commentationes Mathematicae Universitatis Carolinae, Tome 46 (2005) no. 1, pp. 125-130.

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We characterize the subsets of the Alexandroff duplicate which have a G$_\delta$-diagonal and the subsets which are M-spaces in the sense of Morita.
Classification : 54B99, 54E18
Keywords: Alexandroff duplicate; resolution 
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Mizokami, Takemi. On subsets of Alexandroff duplicates. Commentationes Mathematicae Universitatis Carolinae, Tome 46 (2005) no. 1, pp. 125-130. http://geodesic.mathdoc.fr/item/CMUC_2005__46_1_a10/