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## Main Question or Discussion Point

Can someone give me a simple derivation of the ux/c^2 in the numerator of the Lorentz time contraction equation? u = relative velocity

Why isn't the equation just (t-x/c)/gamma because of the time delay in light going from x to O. Im guessing because the source is moving away from O, we have to multiply x/c by u/c? I hope someone can understand what I am trying to ask.

Why isn't the equation just (t-x/c)/gamma because of the time delay in light going from x to O. Im guessing because the source is moving away from O, we have to multiply x/c by u/c? I hope someone can understand what I am trying to ask.