Hello,
I just stumbled upon some weird behavior when trying to solve a PDE
using Laplace transform.
This is what I've done:
var ('t, z, s')
f = function ('f', z, t)
laplace (f.diff(z), t, s)
As result, I get:
s*laplace(f(t, z), t, s) - f(0, z)
which is not correct at all. Calculating by hand, I got d/dz *
laplace(f(t,z), t, s). (Applying Leibniz' rule here)
Now, if I use the exact same code as above, but change the function
definition from:
f = function ('f', z, t)
to
f = function ('f', t, z)
I get
D[0](laplace)(f(t, z), t, s)*D[1](f)(t, z)
What's going on here?
Richard
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