Relativity, Physics, Math, Einstein, Spacetime.
by the light signal (not the frame K’) in a time 𝑡′. Then how can this parameter be used for the frame K’? Further, for the light signal, it is never 𝑥′ = 0 except at the beginning of its travel where we also concurrently have 𝑥 = 0, 𝑡 = 0 and 𝑡′ = 0. All these concurrent values, when substituted