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On 07/04/2009 01:31 PM, Moses Fayngold wrote in part:
"While we're on the subject, it strikes me as beyond bizarre that
anyone would ask students to give up the idea that the length of a
ruler is /the/ length of the ruler ... and that the length is
invariant with respect to rotations. The spacetime approach says the
length is invariant under rotations in the XY plane and also
rotations in the XT plane, i.e. boosts, i.e. changes of velocity."