LudovicoVan
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From:
London
Registered:
2/8/08


Re: Cantor's first proof in DETAILS
Posted:
Nov 13, 2012 12:05 PM


"Zuhair" <zaljohar@gmail.com> wrote in message news:86a85cce2a844c9fb860527958274b50@o8g2000yqh.googlegroups.com... <snip>
> Theorem 4. for all i. x_i =/= L > > <...> > > Let J=L > > QED
Same argument, same objection: as easily proven, the limit interval here must be degenerate, that is it is the singleton (in interval notation) [L;L]. So what you claim amounts to saying that the limit value L is not in (x_n), but that is just incorrect in that if you consider the limit value, then of course it does belong to (x_n), in the limit! More formally L = lim_{n>oo} (a_n) = lim_{n>oo} (b_n) , then just consider an injection from N* instead of N and you can even talk meaningfully about that "last value".
You should rather try and show the mistake in my objection instead of proposing the same argument again and again. As I had put it there:
<< an omegath endpoint, a_oo, would necessarily be drawn from an omegath entry of the sequence! Formally, we have the following property:
A m : a_m e (x_n) & b_m e (x_n)
That works not only for n and m in N, but also for n and m in N*. >>
Objection to Cantor's First Proof <https://groups.google.com/d/msg/sci.math/T2V4Jh7zzD8/wDM_wsyQZ0QJ>
(Note that mine is against Cantor's First Proof of which yours remains a paraphrase, not a faithful reproduction.)
LV

