Timeline for Preservation of properness

7 events

when toggle format	what		by	license	comment
Mar 1, 2015 at 14:45	comment	added	Victoria Gitman		Ah, yes, of course, ${\rm CH}$ still has to hold, so the assumption is implicit.
Mar 1, 2015 at 11:14	comment	added	Goldstern		To clarify the "removal" of CH: If $P$ is $\sigma$-closed and nontrivial (say: corresponds to an atomless Boolean algebra), then $P$ has size at least continuum. So you still need CH. (You just don't need to mention it as it follows from $\|P\|=\aleph_1$.)
Jan 10, 2015 at 14:52	history	edited	Victoria Gitman	CC BY-SA 3.0	got rid of ${\rm CH}$ assumption
Jan 10, 2015 at 14:46	history	edited	Victoria Gitman	CC BY-SA 3.0	got rid of ${\rm CH}$ assumption
Jan 10, 2015 at 1:49	history	edited	Monroe Eskew	CC BY-SA 3.0	fixed a typo
Jan 10, 2015 at 1:20	history	edited	Victoria Gitman	CC BY-SA 3.0	added 65 characters in body
Jan 10, 2015 at 1:05	history	answered	Victoria Gitman	CC BY-SA 3.0