Re: ... cosmology? KNIGHT & KNAVE

From: Bruno Marchal <>
Date: Thu, 22 Jul 2004 16:27:02 +0200


You may be saying something, but the problems are not that sophisticate.
There where "default hypothesis", sure, like the hypothesis that the Knights
and Knaves understand English ..., knows how to use a phone, and
are able to survive more than a nanosecond ...
There might be sense in your remarks about consistency, but the
puzzles are supposed to introduce slowly the not so easy notion of consistency.
Also logic does not necessitate decidability. Let go slowly.


At 06:26 22/07/04 -0700, James N Rose wrote:
>Nice story and game depiction; it does help - somewhat - to explain
>a more expansive generalization of 'decidability' ..the bedrock on
>which 'logic' (at least for the traditional understanding of that term)
>Global consistency 'permits' decidability 'which permits' logic.
>But there are prefaces to -those- relations. And direct indication
>thereby that consistency is 'necessary' but not alone 'sufficient'
>to arise 'decision', and then 'logic'.
>Case: have your student place the call. but the native answers in
>cantonese ; or, doesn't know the significance of the device called
>'phone' and thinks it just an interesting noise-maker.
>A 'consistency' of co-presence would exist in such a universe, but
>not a 'requisite interaction' rule.
>Yet a 'logic of co-existence' -would- exist _strong enough and pervasive
>enough_ to accomodate co-presence -with- 'involvement and no involvement'
>So .. first there must be a:
>"global consistency 'which permits' decidability AND non-decidability"
>before you can generate the option sub-path ..
>Global consistency 'permits' decidability 'which permits' logic.
>Jamie Rose
>Ceptual Institute
Received on Thu Jul 22 2004 - 10:26:57 PDT

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