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To Paul B. Andersen (paul.b.andersen@hia.no) In fact, like other SR experts, you forgot how the LT have been derived. In particular, time is counted from the instant at which the origins of the two frames of reference S and S' coincide. Iow, t=t'=0 when x=x'=0. If a light pulse or an object starts from the coincident origins at time t=t'=0, it will be at x=ct or x=Vt according to S, and at x'=ct' or x'=V't' according to S'. The classical LT x'=gamma(x-vt) and t'=gamma(t-vx/c^2) can be written x'=gamma*t(V-v) and t'=gamma*t(1-Vv/c^2), where x=Vt. Clearly, t' can be negative only if V>c, which is forbidden by relativity. |
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Index Original post and context: 243a1189.0203160522.280953fb@posting.google.com |