"On the existence of a sigma-closed dense subset" . . . . "On the existence of a sigma-closed dense subset" . . "1"^^ . . . "3" . . . . "It is consistent with the axioms of set theory that there are two condense partial orders, one of them sigma-closed and the other one without a sigma-closed dense subset."@en . . "P(IAA100190902), P(MEB060909), Z(AV0Z10190503)" . . "forcing; sigma-closed dense subset"@en . . . "51" . "1"^^ . "RIV/67985840:_____/10:00353290!RIV11-MSM-67985840" . "276859" . . "RIV/67985840:_____/10:00353290" . "5"^^ . "[0A36B9CFE274]" . "It is consistent with the axioms of set theory that there are two condense partial orders, one of them sigma-closed and the other one without a sigma-closed dense subset." . "On the existence of a sigma-closed dense subset"@en . . "On the existence of a sigma-closed dense subset"@en . "Zapletal, Jind\u0159ich" . "CZ - \u010Cesk\u00E1 republika" . "Commentationes Mathematicae Universitatis Carolinae" . "0010-2628" . . .