Relativity Principle Revisited

On 26 Aug, 15:41, Tom Roberts wrote in
sci.physics.relativity:
Koobee Wublee wrote:
To validate SR in these experiments, you must observe a mutual time
dilation in accordance with the principle of relativity,

I keep telling you that you do not understand SR, and this statement of
yours is direct evidence of that. There is no such requirement, because
the PoR refers to INERTIAL FRAMES and these experiments do not have two
inertial frames -- in ALL cases one observer is accelerated.

Roberts Roberts is the acceleration the cause of the greater
youthfulness of the travelling twin? Consider Problem 19, "Modified
twin paradox", on p. 49, solution on p. 65, in

http://www.courses.fas.harvard.edu/~...tbook/ch10.pdf

In the previous version of the textbook there was the following
additional text:

"This form of the twin paradox loses a bit of the punch of the usual
statement of the problem, since we don't compare the ages of the same
two people before and after the journey. But on the other hand, THIS
VERSION OF THE PROBLEM DOES NOT INVOLVE ACCELERATION."

So stop referring to this acceleration Roberts Roberts. In 1918
Einstein tried to deduce greater youthfulness from acceleration but
failed and you Roberts Roberts, being the Albert Einstein of our
generation (Hawking is no longer the Albert Einstein of our
generation), you will also fail.

Pentcho Valev