Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
Drexel University or The Math Forum.


Virgil
Posts:
8,833
Registered:
1/6/11


Re: ? 417 An implication of actual infinity
Posted:
Jan 17, 2014 3:46 PM


In article <10c1d90762a5470fbb04fbd37ef27ff7@googlegroups.com>, mueckenh@rz.fhaugsburg.de wrote: > On Friday, 17 January 2014 16:59:23 UTC+1, wpih...@gmail.com wrote: > > On Friday, January 17, 2014 8:54:19 AM UTC4, muec...@rz.fhaugsburg.de > > wrote: > > > On Tuesday, 14 January 2014 23:14:55 UTC+1, wpih...@gmail.com wrote: > > > > > I am not considering the limit > > > > So you are not considering an infinite sum. > > > If there are infinitely many natural numbers, then I am considering > > > infinitely many finite sums. > > And, by definition, the infinite sum is the limit of > > the infinitely many finite sums. So if you do not consider > > the limit you do not consider the infinite sum. > There is no infinite sum but, as you say, only the limit. This limit has no > definition by infinitely many numbers, because in mathematics, never > infinitely many numbers can be listed number by number. A sequence of positive real numbers whose partial sums are collectively bounded,, will have a limit sum, regardless of whether WM has any finite definition for such a sum or not.
Or does WM claim a "real number system" in which there are of sets of rationals bounded above that need not have any least upper bound?
WM's systems are sufficiently strange that he might just claim that. 



