Brent Meeker writes:
> > Empirical science is universe-specific: eg., any culture, no matter how
> > bizarre its psychology compared to ours, would work out that sodium
> > reacts exothermically with water in a universe similar to our own, but
> > not in a universe where physical laws and fundamental constants are
> > very different from what we are familiar with.
> > Mathematical and logical truths, on the other hand, are true in all
> > possible
> > worlds.
> But this is really ciruclar because we define "possible" in terms of obeying
> rules of logic and reason. I don't say we're wrong to do so - it's the best
> can do. But it doesn't prove anything. I think the concept of logic,
> mathematics, and truth are all in our head and only consequently in the world.
Isn't this like saying that a physical object must be perceived iin order to
exist? We define physical phenomena in terms of the effect they have on our
senses or scientific instruments, but we assume that they are still "there"
they are not being observed.
> >The lack of contingency on cultural, psychological or physical
> > factors makes these truths fundamentally different; whether you call
> > them perfect, analytic or necessary truths is a matter of taste.
> If you directly perceived Hilbert space vectors, which QM tells us describe
> world, would you count different objects? I think these truths are
> on how we see the world. I think there's a good argument that any being that
> both intelligent and evolved will have the same mathematics - that's the jist
> Cooper's book.
If we lived in a world where whenever two objects were put together, a third
magically appeared, would that mean that
(a) 1+1=3, because we would think that 1+1=3
(b) 1+1=2, but we would mistakenly think 1+1=3
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