Relativity, Physics, Math, Einstein, Spacetime.
italics on the mistakes (placed between dotted lines). A light-signal, which is proceeding along the positive axis of x, is transmitted according to the equation 𝑥 = 𝑐𝑡 Or, 𝑥 − 𝑐𝑡 = 0 . . .(1) Since the same light-signal has to be transmitted relative to K’ with the velocity c, the propagation