>
> Secondly, what are you trying to collect? The D[0,0] terms or
> f(xp, yp, zp, tp), x, 2) which are two different things?
What is the difference between those 2?
> Given
> what you are trying to do I guess it is the first one, in which
> case you should have tried
>
> sage: term = f(
What are computed operators? Are those the D[0, 0] things? How avoid
those? Is that same as second derivative of 1st variable?
On Sun, Jan 24, 2021, 11:33 AM Emmanuel Charpentier <
emanuel.charpent...@gmail.com> wrote:
> Probably because “the given second derivative” has a “computed operator”…
>
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 se
>
> 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'm trying to collect all the terms in an expression with the same
second partial derivative but it doesn't seem to be working.
I can't figure out why.
Here is my code
#
function("xp yp zp tp f")
var("x y z t v c")
xp = (x - v *
I have some simple Sage interactives that used to work but I recently tried
them and they don't anymore.
I tried creating other toy examples and they also don't work.
https://seberino.pythonanywhere.com/static/electric_force.html
Did something change recently like the URL should use for
sa
Dominique
THANK YOU! Without or without declaring x your way works
This...
var("y C")
solve( log(y) == C + log(x) + log(y-1),x)
solve( x == y/(y*e^C - e^C), y)
Gives...
[y == x*e^C/(x*e^C - 1)]
What is amazing is that simply having y appear in 2 places makes it
unsolvable directly withou
