Title of article :
On perfect pre-images of ω1
Author/Authors :
Eisworth، نويسنده , , Todd، نويسنده ,
Issue Information :
دوماهنامه با شماره پیاپی سال 2002
Abstract :
We show that PFA implies that every perfect pre-image of ω1 of countable tightness contains a closed copy of ω1.
Keywords :
Proper forcing axiom , Pre-images of ?1 , Totally proper forcing , Countable tightness
Journal title :
Topology and its Applications
Journal title :
Topology and its Applications
