EINSTEINIANA'S LOGIC

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#6728

From: Pentcho Valev
Date: Thu, 07 May 2009 05:49

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http://philsci-archive.pitt.edu/archive/00000960/
Why Thought Experiments Do Not Transcend Empiricism
John D. Norton 2002
"(D1) In Euclidean geometry, the measured circumference of a disk is
pi times its diameter. (Premise)
(D2) The geometry of a non-rotating disk is Euclidean. (Premise)
(D3) The motion of a radial element on a rotating disk is
perpendicular to its length, so that (according to special relativity)
the length is unaltered. (Premise)
(D4) The motion of a circumferential element on a rotating disk is
along its length, so that (according to special relativity) the length
is contracted. (Premise)
(D5) Therefore the measured circumference of a rotating disk is more
than pi times the measured diameter. (From D2, D3, D4)
(D6) Therefore the geometry of a rotating disk is not Euclidean. (From
D1, D5)"

Good logic? Bad logic? Does D5 follow from D4? Note that John Norton
is the cleverest Einsteinian so if his logic (which is Divine Albert's
logic of course) is bad, let us try to imagine the logic of much
sillier Einsteinians.

Pentcho Valev
pvalev@yahoo.com

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From: Pentcho Valev <pvalev@yahoo.com>
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Subject: EINSTEINIANA'S LOGIC
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