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The year 2008 marks the 150th anniversary of " A Memoir on the Theory of Matrices " by Arthur Cayley (1821–1895) [3]—the first paper on matrix algebra. Prior to this paper the theory of determinants was well developed, and Cauchy had shown that the eigenvalues of a real matrix are real (in the context of quadratic forms). Yet the idea that an array of(More)
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