On the positivity and stability of non-s
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M.K. Sundareshan; M.A.L. Thathachar
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Article
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1976
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Elsevier Science
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English
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## The positivity of operators in Hilbert spaces is an important concept finding wide application in various branches of Mathematical System Theory. A frequencydomain condition that ensures the positivity of time-varying operators in L2 with a state-space description, is derived in this paper by usi