Comment #80 on issue 1598 by smichr: New polynomials manipulation module
http://code.google.com/p/sympy/issues/detail?id=1598
I ran into some problems (see issue 1725) when trying to do an equality
test. If you
would write
if isinstance(b, AlgebraicNumber)
rather than
if not b.is_AlgebraicNumber:
then b=='foo' will not fail (since 'foo' has no attribute
is_AlgebraicNumber). This
should probably be a sympy wide standard for equality testing: first see if
it's an
instance of what you are interested in
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