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Juhász, István
A weakening of $\clubsuit$, with applications to topology. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 29 (1988), issue 4, pp. 767-773
MSC: 03E05, 54A25, 54A35, 54D30 | MR 982796 | Zbl 0676.54005
References:
[1] Dow A.: An introduction to applications of elementary submodels to topology. Prepгint no 88-04, York Univ. Zbl 0696.03024
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[З] Kunen K.: Set theory. Amsterdam, North Holland Pub. Co., 1980. MR 0597342 | Zbl 0443.03021
[4] Malychin V.: Bikompakt Fréchet-Urysona bez toček... Mat. Zametki 41 (1987), 365-376. MR 0893365
[5] Ostaszewski A.: On countably compact, perfectly normal spaces. J. London Math. Soc. 14 (1976), 505-516. MR 0438292 | Zbl 0348.54014
[6] Šapirovskii B.: On the tightness, $\pi $-weight and related notions... Uč. Zap. Latv. Univ. 257 (1976), 88-89. (in Russian).
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