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In special relativity formulas for changing coordinates x,t into x',t' are based on the relative velocity of the 2 frames. What is the base for assuming that if v is the velocity of frame O' relative to frame O, the velocity of O measured by somebody on O' will be -v?

Schwein
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    Can you clarify your question a bit? Also, I believe what you ask, at least in this form, does not need to be thought in the realm of special relativity -- it seems more like a fundamental one on reference frame translations. –  Aug 13 '19 at 09:33
  • When i read the derivation of x&t as functions of x'&t' , then they say for the inverse we need to replace v' for v, because if O' moves r.t.O with speed v then O is moving r.t O' with -v. It is clear they assume that. But why? – Schwein Aug 14 '19 at 06:55

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