A closed separable subspace not being a retract of $\beta N$
Commentationes Mathematicae Universitatis Carolinae, Tome 25 (1984) no. 2, pp. 364-365.

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Classification : 54D35
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     author = {Simon, Petr},
     title = {A closed separable subspace not being a retract of $\beta N$},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
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     volume = {25},
     number = {2},
     year = {1984},
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Simon, Petr. A closed separable subspace not being a retract of $\beta N$. Commentationes Mathematicae Universitatis Carolinae, Tome 25 (1984) no. 2, pp. 364-365. http://geodesic.mathdoc.fr/item/CMUC_1984__25_2_a17/