"Tom Roberts" wrote in message
...
| Peter Christensen wrote:
| To be very short: I'm trying with vectors like this: (c*"proper
| time",x,y,z) and (m*c,p_x,p_y,p_z) instead of the usual representation
| with (c*t,x,y,z) and (E/c,p_x,p_y,p_z).
|
| Make sure they are indeed vectors. Arbitrary collections of four
| quantities, even with an obvious relationship, need not be the
| components of vectors.

Time is not a vector, it has no additive inverse.
Arbitrary collections of four quantities, even with an obvious
relationship, need not be the components of vectors. scumbag cretin