On Thu, May 30, 2013 at 04:19:53PM -0700, meekerdb wrote:
> On 5/30/2013 3:43 PM, Russell Standish wrote:
> >On Thu, May 30, 2013 at 12:04:13PM -0700, meekerdb wrote:
> >>You mean unprovable?  I get confused because it seems that you
> >>sometimes use Bp to mean "proves p" and sometimes "believes p"
> >>
> >To a mathematician, belief and proof are the same thing.
> 
> Not really.  You only believe the theorem you've proved if you
> believed the axioms and rules of inference.  What mathematicians
> generally believe is that a proof is valid, i.e. that the conclusion
> follows from the premise.  But they choose different premises, and
> even different rules of inference, just to see what comes out.

Fair enough, although if you're a Platonist, I guess you believe in
some axioms - the PA ones, for instance.

Anyway, this is rapidly departing my area of expertise :).

Cheers 

-- 

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Prof Russell Standish                  Phone 0425 253119 (mobile)
Principal, High Performance Coders
Visiting Professor of Mathematics      hpco...@hpcoders.com.au
University of New South Wales          http://www.hpcoders.com.au
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