>
> What you intend to do isn’t really clear… Could you try and clear your
> goals ?
>
Emmanuel
Thanks so much for your help. I'm trying to show that the wave equation
(https://en.wikipedia.org/wiki/Wave_equation)
is invariant under a certain coordinate transformation called the Lorentz
tra
I think that your code doesn’t do what you think it does. Note for example
that your declarations are self-contradicting :
Pasting code; enter '--' alone on the line to stop or use Ctrl-D.
:function("xp yp zp tp f")
:var("x y z t v c")
:--
(xp, yp, zp, tp, f)
(x, y, z, t, v, c)
sage: xp.parent(
