
Re: How many real numbers are there?
Posted:
Jul 8, 2006 12:57 AM


Toni Lassila a écrit : > On 7 Jul 2006 13:30:05 0700, "Nathan" <ntspam2@netscape.net> wrote: > >> Mike Deeth wrote: >> >>> It's wellknown that a countable union of finite sets is countable. >> Nope! You said you were working in ZF. This requires AC. > > No it doesn't.
Even a countable union of pairs can be uncountable (Cohen). You should check your sources.

