Following up on question [1], I'm wondering how one can derive from
sympy.Function in a way that keeps all the original functionality in place.
Something as naive as
```
import sympy
x = sympy.Symbol('x')
a = sympy.Function('a')
a(x) # no problem
class MyTest(sympy.Function):
pass
b = MyTest('b')
b(x) # object is not callable
```
doesn't work: `b` is reported not to be callable here.
Any hints why this might be and how to fix it?
Cheers,
Nico
[1] https://groups.google.com/forum/#!topic/sympy/5mLEq4Gbyfk
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