let s be a symbol and
x = Function('x')(s)
f = Function('f')(x)
Then let F be an expression containing f (UndefinedFuction) and defined
functions.
You want to calculate diff(F,s), but you do not want to evaluate
diff(f,s). You do want to
evaluate the derivatives of all the defined functions. In general you
will not know the names
of the UndefinedFuction(s) in F.
What is a good way of evaluating the derivative of F with respect to s
under this constraint.
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