Talk:Countable chain condition

upwards and downwards
it would be great to get an explanation of _what_ the upwards/downwards ccc are, if they are not equivalent. Zero sharp 20:31, 30 August 2007 (UTC)

duplication with forcing article
This topic is described in Forcing (set theory). Should that material be moved here? Set theorist (talk) 09:31, 25 October 2010 (UTC)