Re: Proper quantities in SR

Stephen Riley wrote:
[...]

I dunno. To me, "proper" always means "in the object's rest frame", so "proper velocity" ought to be identically zero (and therefore useless). I think the puns introduced are not a good idea.

I approach SR from a GR background in which 4-velocity is natural (it's purely geometrical: the tangent to an object's worldline), and I am not involved in teaching undergrads about relativity. I doubt this alternative approach would help any of the incorrigibly ineducable around here....


Tom Roberts
.

Relevant Pages

  • Re: Proper quantities in SR
    ... "proper velocity" ought to be identically zero (and therefore useless). ... 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. ...
    (sci.physics.relativity)
  • Re: Suitable passage to be read at a civil marriage
    ... Paul Wolff wrote: ... Ought to be something useful in Chuang Tzu...maybe the bit about the useless ...
    (alt.usage.english)
  • Re: S moves missile-defense assets to meet NoKo threat on Hawaii
    ... "Olly Mensch" wrote in message ... against North Korea in the past - - and found to be useless?? ... they ought to be tried first, but if it is useless, then strength is the ...
    (soc.retirement)
  • Re: What are Document Object Models?
    ... JS would be isolated and that would render it useless" ... What about "ought"? ... Too doubtful. ... Implies that it often does not. ...
    (comp.lang.javascript)
  • Re: Procedural interface to mysql
    ... made to do what I want to do instead of what someone thinks I ought to want ... This is almost certainly a case of useless optimization. ... majority of its time waiting for the database. ...
    (comp.lang.perl.misc)