Comment #1 on issue 3221 by [email protected]: Matrix.charpoly() should
include minus sign for odd order matrices
http://code.google.com/p/sympy/issues/detail?id=3221
From what I can see, the only method for calculating the characteristic
polynomial is the Berkowitz algorithm, which states that only monic
polynomials are returned. Is another method then needed for computer the
characteristic poly?
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