>> class f(Function):
>>    pass
>> 

The error is also seen when trying to find whether f(10).is_positive:

    >>> f = Function('f')
    >>> f(10).is_positive
    [...]
    RuntimeError: maximum recursion depth exceeded

I have a branch named DetectCycle at github that has a patch fixing this.

[ https://github.com/smichr/sympy/tree/DetectCycle ]

After completing the tests, I'll put in a pull request.

/c

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