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Re: [Phys-l] three central misconceptions about relativity



Moses,

I am voraciously consuming your paper "Three + 1 Faces of Invariance".
Thank you, and congratulations for an extremely significant insight.
Your "Rest mass - proper time analogy" is GOLDEN!!!
-Bob

-----Original Message----- From: Moses Fayngold
Sent: Saturday, October 15, 2011 7:34 PM
To: Forum for Physics Educators
Subject: Re: [Phys-l] three central misconceptions about relativity

On Friday, October 14, 2011 9:13 AM, John Denker wrote in part:

If the two length-computations come out different, there is something
desperately wrong with your coordinate systems, or with your notion of
relative motion, or your definition of length.

True

The t-components will differ from frame to frame, and the x-components
will differ from frame to frame...

True

but the length is invariant.

Wrong.
The last quoted statement is is an excellent illustration of the dangers
associated with upholding the formal abstract part of a theory at the cost
of its physical meaning. The proper length is not an invariant under 4-rotations.
See arXiv:1001.0088v1 [physics.gen-ph]


Moses Fayngold

NJIT
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Bob Sciamanda
Physics, Edinboro Univ of PA (Em)
treborsci@verizon.net
http://mysite.verizon.net/res12merh

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