Relativity, Physics, Math, Einstein, Spacetime.
first of the equations (5) 𝑥′ = 𝑎𝑥 Two points of the x’-axis which are separated by the distance Δx’ = 1 when measured in the K’ system are thus separated in our instantaneous photograph by the distance Δ𝑥 = 1/a. . . .(7) — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — —