Publisher's Synopsis
Excerpt from Three Methods for Refining Estimates of Invariant Subspaces: October, 1895
Methods for refining estimates of invariant subspaces of matrices have been suggested in [chatelin], [dongarra, Moler, Wilkinson], and [stewart]. These three methods (henceforth called C, bmw, and 8, respectively), all solve apparently different equations, since they represent the desired invariant subspace slightly differently. However, by a simple change of basis, we will see that all three methods are attempting to solve the same equation, the Ric cati equation.
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