Hi
I was wondering if it is possible in Sage (perhaps even Maxima) to
change the variable in an ODE or PDE algebraically. I have set up a
simple PDE with the following: -
x, t, k_1, k_2 = var("x t k_1 k_2")
y = function('y', x, t)
PDE = lambda f : k_1 * x^2 * diff(f,x,2) + diff(f,t) + k_2*(x*diff
(f,x)-f)
PDE(y(x,t))
I would like to how to make the change of variable x = exp(z) where z
is real. Is this possible?
Thanks in advance
Blair
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