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hypothesis about the the of propagation of light: it must certainly be
fulfilled if we are to maintain the law of the constancy of the
velocity of light in vacuo.



THE RELATIVITY OF SIMULATNEITY


Up to now our considerations have been referred to a particular body
of reference, which we have styled a " railway embankment." We suppose
a very long train travelling along the rails with the constant
velocity v and in the direction indicated in Fig 1. People travelling
in this train will with a vantage view the train as a rigid
reference-body (co-ordinate system); they regard all events in

                       Fig. 01: file fig01.gif


reference to the train. Then every event which takes place along the
line also takes place at a particular point of the train. Also the