Is there any rigorous way to show that it is impossible to have any inertial reference frame with the speed of light apart from the blow up of the Lorentz factor?
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Qmechanic
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Snpr_Physics
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Possible duplicate: https://physics.stackexchange.com/q/595605/2451 – Qmechanic Nov 22 '20 at 20:48
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The only vectors orthogonal to a lightlike vector are multiples of itself. – WillO Nov 23 '20 at 02:36