Relations between ß X / X and a Certain Subspace of ... X.
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Jan van Mill (1977)
Mathematische Zeitschrift
Igor V. Protasov (2002)
Commentationes Mathematicae Universitatis Carolinae
Answering recent question of A.V. Arhangel'skii we construct in ZFC an extremally disconnected semitopological group with continuous inverse having no open Abelian subgroups.
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