7.4. Computations of Invariant factors. Let A be nxn matrix with entries in F[x]. Goal: Find a method to compute the invariant factors p 1 ,…,p r . Suppose A is the companion matrix of a monic polynomial p=x n +c n-1 x n-1 +…+c 1 x+c 0. Thus det(xI-A)=p.
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