The solvability conditions of matrix equations with k-involution (Q3165176)

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The solvability conditions of matrix equations with k-involution
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    The solvability conditions of matrix equations with k-involution (English)
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    25 October 2012
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    \(k\)-involution
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    \((P,Q,\beta)\)-symmetric matrices
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    \((P,Q,\alpha,\beta)\)-symmetric matrices
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    matrix equations
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    optimal approximation
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