Updates:
Status: WontFix
Comment #10 on issue 3221 by asmeu...@gmail.com: Matrix.charpoly() should
include minus sign for odd order matrices
http://code.google.com/p/sympy/issues/detail?id=3221
I didn't realize that it was defined the other way. According to
http://en.wikipedia.org/wiki/Characteristic_polynomial, the other way is
the characteristic equation. The advantage over the way we currently do it
is that the polynomial is always monic, and the advantage of the other way
is that the constant term is always det(A). But it seems arbitrary
otherwise, and so since we already do it one way, let's just stick with it.
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