Emmanuel But my question is more simple than that. I just want to know why the collect method was not able to collect all the terms with the given second derivative.
On Sun, Jan 24, 2021, 2:15 AM Emmanuel Charpentier < emanuel.charpent...@gmail.com> wrote: > Sage has recently acquired a large set of tools relative to manifolds > <https://sagemanifolds.obspm.fr/>. A look at these tools and related > tutorials/references may be in order… > > HTH, > > Le samedi 23 janvier 2021 à 23:17:26 UTC+1, cseb...@gmail.com a écrit : > >> 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 >> transformation (special relativity). >> >> I represent the function that obeys the wave equation in the primed >> coordinate system by f(xp, yp, zp, tp). >> >> I also represent the primed coordinates by the coordinates in the >> unprimed coordinate system. >> Therefore, f(xp, yp, zp, tp) = f(xp(x, y, z, t), yp(x, y, z, t), zp(x, >> y, z, t), tp(x, y, z, t)). >> >> I then find a bunch of derivates of f(xp(x, y, z, t), yp(x, y, z, t), >> zp(x, y, z, t), tp(x, y, z, t)) and try to collect terms. >> >> All the coordinates should be real numbers. >> >> Does that explain everything? >> >> >> >> > -- > You received this message because you are subscribed to a topic in the > Google Groups "sage-support" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/sage-support/TDseIA1M7vY/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > sage-support+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sage-support/068e5ac0-1d78-453f-a465-bc84e1d1fc90n%40googlegroups.com > <https://groups.google.com/d/msgid/sage-support/068e5ac0-1d78-453f-a465-bc84e1d1fc90n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/CAG5-5iKn4APn1FRBfXoxeyzbcCDdLFyqssehxuNYQJ5f0yzi7w%40mail.gmail.com.
