Positive solutions to the equations A X = C and X B = D for Hilbert space operators
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2007-09-15
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Journal of Mathematical Analysis and Applications
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ACADEMIC PRESS INC ELSEVIER SCIENCE
Melbourne Authors
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Mathematics and Statistics
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Dajić, A. & Koliha, J. J. (2007). Positive solutions to the equations A X = C and X B = D for Hilbert space operators. Journal of Mathematical Analysis and Applications, 333 (2), pp.567-576. https://doi.org/10.1016/j.jmaa.2006.11.016.
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The paper studies the equation AX=C for bounded linear operators between Hilbert spaces, gives conditions for the existence of hermitian solutions and positive solutions, and obtains the formula for the general form of these solutions. Then the common hermitian and positive solutions to the equations AX=C and XB=D are studied and new representations of the general solutions are given. Many results for matrices are recovered as special cases, and the results of Phadke and Thakare [S.V. Phadke, N.K. Thakare, Generalized inverses and operator equations, Linear Algebra Appl. 23 (1979) 191–199] are corrected.
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Pure Mathematics