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

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Posts: 4,165
From: London
Registered: 2/8/08
Re: Is it possible that 3+4=8?
Posted: Jan 24, 2011 5:02 AM
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On Jan 23, 8:31 pm, LudovicoVan <> wrote:
> On Jan 23, 7:47 pm, Craig Feinstein <> 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.


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