Updates:
Cc: [email protected]
Blockedon: sympy:1688
Comment #1 on issue 3313 by [email protected]: Function class violates
Liskov substitution principle
http://code.google.com/p/sympy/issues/detail?id=3313
This is because of the hackish way that Function works. Function('a') is a
subclass of Function, not an instance. In other words, a is more akin to
FooFunction here than to b. See issue 1688.
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