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Topic: Is it possible that 3+4=8?
Replies: 21   Last Post: Jan 29, 2011 9:06 AM

 Messages: [ Previous | Next ]
 Virgil Posts: 8,833 Registered: 1/6/11
Re: Is it possible that 3+4=8?
Posted: Jan 24, 2011 2:58 PM

In article

> On Jan 24, 11:02 am, LudovicoVan <ju...@diegidio.name> wrote:
> > On Jan 23, 8:31 pm, LudovicoVan <ju...@diegidio.name> wrote:
> >

> > > On Jan 23, 7:47 pm, Craig Feinstein <cafei...@msn.com> wrote:
> >
> > > > [...]
> > > > In our real world, it is a known fact that 3+4=7. But how can we be
> > > > sure that there are no invisible pixies running around taking balls
> > > > away from us causing us to think that 3+4=7 when really 3+4=8?

> >
> > > > My point is that mathematics is considered a deductive science, in
> > > > which everything is absolutely certain. But how can mathematics prove
> > > > that the above scenario cannot be true?

> >
> > > I don't think mathematics is a deductive science: mathematics is
> > > hardly a science at all. OTOH, in a world were 3+4=7, I'd also expect
> > > 1=/=0: i.e. no mathematical fact exists in isolation...

> >
> > Thinking: It is logic that grounds mathematics, i.e. it is logic that
> > gives mathematics its initial premise and final validation.
> >
> > -LV

>
> How can that be, if Mathematical Logic is a branch of mathematics ?
> It is NOT logic that grounds mathematics. It is rather mathematics
> that grounds logic. (And physics grounds mathematics, but that is ..
> quite another story)

Except that, at least historically, mathematics preceded physics.

Agriculture and Commerce, but not physics, preceded mathematics
(agriculture gave rise to geometry and commerce to arithmetic).

Date Subject Author
1/23/11 Craig Feinstein
1/23/11 master1729
1/23/11 LudovicoVan
1/24/11 LudovicoVan
1/24/11 LudovicoVan
1/24/11 Virgil
1/23/11 Ilmari Karonen
1/23/11 Ilmari Karonen
1/23/11 Virgil
1/23/11 Tim Little
1/23/11 Joshua Cranmer
1/24/11 hagman
1/24/11 Joshua Cranmer
1/23/11 Brian Chandler
1/24/11 donstockbauer@hotmail.com
1/24/11 cwldoc
1/24/11 Craig Feinstein
1/24/11 Joshua Cranmer
1/24/11 Craig Feinstein
1/25/11 Hauke Reddmann
1/29/11 Bill Taylor