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To reduce the costs of computing matrix–vector product Ax related to a centrosymmetric matrix A as compared to the case of an arbitrary matrix A, two algorithms were proposed recently, one was designed by Melman [A. Melman, Symmetric centrosymmetric matrix–vector multiplication, Linear Algebra Appl. 320 (2000) 193–198] for symmetric centrosymmetric matrices, another was presented by Fassbender and...
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