Countable tightness and proper forcing

Balogh, Z.; Dow, A.; Fremlin, D. H.; Nyikos, P. J.

doi:10.1090/S0273-0979-1988-15649-2

Countable tightness and proper forcing
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by Z. Balogh, A. Dow, D. H. Fremlin and P. J. Nyikos PDF

Bull. Amer. Math. Soc. 19 (1988), 295-298

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