Comment #16 on issue 2205 by [email protected]: "Undefined functions"
http://code.google.com/p/sympy/issues/detail?id=2205
BTW for current implementation of Function in master this test holds:
>>> f(2)**2
f(2)**2
>>> _.subs(f, sin)
sin(2)**2
@ronan, just a little question which I should like to clarify right now.
what is target aim is planned for present `Function`?
Would it be obsolated, or maintains only defined `sin(x)`, or something
else?
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