Comment #5 on issue 2205 by ronan.l...@gmail.com: "Undefined functions"
http://code.google.com/p/sympy/issues/detail?id=2205
asmeurer: Yes, Function('f') should continue to work as it does now.
smichr: The original reason for the change is that using a separate class
clarifies the code. But, as is often the case, it also makes sense from a
conceptual point of view: "undefined functions" are actually used as
function Symbols, and hence are quite different from objects such as cos,
sin, exp...
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