Relativity, Physics, Math, Einstein, Spacetime.
events other than those of light, the result is bound to be non-zero, as for these, 𝑥 − 𝑐𝑡 ≠ 0, 𝑥 + 𝑐𝑡 ≠ 0, 𝑥′ − 𝑐𝑡′ ≠ 0 and 𝑥′ + 𝑐𝑡′ ≠ 0. But these facts have been ignored when switching over to material bodies like the origin of moving frame and unit measuring-rod for finding out value of