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Comments on “The matrix sign function and computations in systems” by E. D. Denman and A. N. Beavers |
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| Authors: | Stephen Barnett |
| Affiliation: | School of Mathematics University of Bradford West Yorkshire BD71DP, UK England |
| Abstract: | The suggested method of Denman and Beavers for solving a Lyapunov matrix equation is shown to fail when the solution is not unique. It is also shown that sgnA can be used to determine the inertia of A. |
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