Dear All
How is it possible to differentiate between defined(internal) and
undefined functions?
For example:
x = symbols('x')
f = Function('f')(x)
eq=cos(x)+f
s=eq.atoms(Function)
>>> s
set(f(x), cos(x))
so I would like
for i in s:
IS_INTERNAL(i) or IS_DEFINED(i) or whatever
and get something like that
f(x) -> False
cos(x) -> True
Thanks
V
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