Relativity, Physics, Math, Einstein, Spacetime.
constant; for, according to (3), the disappearance of (𝑥 − 𝑐𝑡) involves the disappearance of (𝑥′ − 𝑐𝑡′). If we apply quite similar considerations to light rays which are being transmitted along the negative x-axis, we obtain the condition (𝑥′ + 𝑐𝑡′) = 𝜇 (𝑥 + 𝑐𝑡) . . . (4). — — — — — — — — — — — — —