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  1. Countable Fréchet Boolean groups: An independence result.Jörg Brendle & Michael Hrušák - 2009 - Journal of Symbolic Logic 74 (3):1061-1068.
    It is relatively consistent with ZFC that every countable $FU_{fin} $ space of weight N₁ is metrizable. This provides a partial answer to a question of G. Gruenhage and P. Szeptycki [GS1].
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  • Countable Fréchetα 1-spaces may be first countable.Alan Dow & Juris Stepräns - 1992 - Archive for Mathematical Logic 32 (1):33-50.
    It is shown to be consistent that countable, Fréchet,α 1-spaces are first countable. The result is obtained by using a countable support iteration of proper partial orders of lengthω 2.
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