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From: Brent Meeker <meekerdb.domain.name.hidden>

Date: Wed, 20 Sep 2000 20:57:48 -0700

I guess I don't understand your question. First order predicate logic applies to propostions (or declarative sentences) which have values of 'true' and 'false'. The rules of logical inference propagate 'true'. Now I imagine a different universe...what elements of this differen universe does logic apply to? It applies to propositions. Am I to imagine that 'propositions' are something different in this different universe. If so, then I'm at a loss...I don't know what to imagine!?

Of course there are different logics that have been invented to apply to

sentences that are not simple declarative. But I don't see what they have to

do with other universes.

Please explain.

Brent Meeker

On 20-Sep-00, John Bailey wrote:

*> Brent Meeker wrote:
*

*>
*

*>> Logic and number theory and in fact any mathematical theory are independent
*

*>> of physical reality since they are simply sets of axioms and their
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*>> consequences according to some rule of inference.
*

*>>
*

*>> Euclidean geometry didn't change in 1823; only the idea that it necessarily
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*>> applied to the physical world changed.
*

*>
*

*> That's exactly the point of departure. Before 1823 no one realized that there
*

*> was a question of the applicability. After non-Euclidean geometry came to be
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*> recognized, the question arose. Paralleling that episode in the maturing of
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*> mind, I am asking whether it is conceivable that variations of logic could
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*> apply within different universes.
*

*>
*

*>> There are many physical entities that number theory does not apply to. It's
*

*>> just that the the non-applicability is so obvious that one doesn't usually
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*>> think of number theory applying. For an example that sometimes trips up 4th
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*>> graders; consider that there are two school clubs, one with 15 members and
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*>> one with 20 members. They have picnic together. How many are at the picnic?
*

*>
*

*> This is sophistry. The question is, to the same logic which we would all
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*> agree applies to basic elements, is it conceivable that there are universes
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*> in which this logic, mapped to the same elements behaves differently?
*

*>
*

*> John
*

*>
*

*>
*

Regards

Received on Wed Sep 20 2000 - 21:08:23 PDT

Date: Wed, 20 Sep 2000 20:57:48 -0700

I guess I don't understand your question. First order predicate logic applies to propostions (or declarative sentences) which have values of 'true' and 'false'. The rules of logical inference propagate 'true'. Now I imagine a different universe...what elements of this differen universe does logic apply to? It applies to propositions. Am I to imagine that 'propositions' are something different in this different universe. If so, then I'm at a loss...I don't know what to imagine!?

Of course there are different logics that have been invented to apply to

sentences that are not simple declarative. But I don't see what they have to

do with other universes.

Please explain.

Brent Meeker

On 20-Sep-00, John Bailey wrote:

Regards

Received on Wed Sep 20 2000 - 21:08:23 PDT

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