So far, I've always defined functions as
```
class f(sympy.Function):
pass
```
which I could then conveniently use as
```
x = sympy.Symbol('x')
y = f(x)
```
Nice.
Now, I would like to define a function that itself returns a function, aka,
an operator. It should be used as
```
y = op(u)(x)
```
With the naïve definition above, I'm getting
```
TypeError: 'op' object is not callable
```
Any hints?
Cheers,
Nico
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