FWD (SK) Re: Cosmology Question [fringe theories]

From: Terry W. Colvin (fortean1@mindspring.com)
Date: Wed Feb 26 2003 - 10:28:54 MST

  • Next message: Amara Graps: "FWD (SK) Re: Cosmology Question [fringe theories]"

    Terry W. Colvin forwarded, from Amara:
    >BTW: news to me that a model is not a theory...
    >I wonder what I've been doing the last n years!

    Strictly speaking, a model is a set of assignments that is consistent with
    a theory under some semantics.

    For example, the theory:

    a=>~b
    b=>~a

    (where => is implication and ~ is negation)

    has two models

    {a, ~b} and
    {b, ~a}

    There are many ways of specifying models but, roughly speaking, the idea is
    that the model is an instance of the theory -- e.g. increased resistance to
    antibiotics in bacteria may be a model of evolution theory.

    Best,
    Ludi

    Ludwig Krippahl 

    -- 
Terry W. Colvin, Sierra Vista, Arizona (USA) < fortean1@mindspring.com >
     Alternate: < fortean1@msn.com >
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