Status: Valid
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 3547 by smi...@gmail.com: Undefined functions with number
arguments should have is_number be False
http://code.google.com/p/sympy/issues/detail?id=3547
Function('f')(1).is_number
True
Perhaps it would be better to have this be False since it can't be
evaluated to a number with evalf. Alternatively, such quantitites should be
disallowed in solve (solve(f(1) - 2, f(1)) gives [2]) and Indexed variables
used instead.
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