Re: Proper quantities in SR

Stephen Riley wrote:
In my edition of "Spacetime physics" 'proper velocity' doesn't get a mention except in as much to say that it would be improper to mix different frames of reference to calculate it.

Yes.


Perhaps it's the word 'proper' that is inappropriate here,

Yes, because that word is used with a quite different meaning everywhere else.


or the quantity not strictly an SR one?

One can define whatever quantities one wants. But mixing frames like this and using an inappropriate PUN make this quantity highly undesirable to me.


Tom Roberts
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