Re: Incorrect mathematical integration

Le 23/07/2024 à 23:29, "Paul.B.Andersen" a écrit :

Den 22.07.2024 23:37, skrev Richard Hachel:
 But "proper speed" is never used in SR because:That's right.

But why exactly?
Physicists use apparent speeds and apparent times, like Hachel.
Physicists use observable times and observable speeds like Hachel.
Physicists use proper times like Hachel.
Very strangely, they do not use proper speeds, or real speeds like Hachel.
For what?
R.H.