Talk:Kalman–Yakubovich–Popov lemma

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Can some body please add a proof of this lemma? especially from dissipative systems viewpoint. Thank you very much.... —Preceding unsigned comment added by Alimolwiki (talk • contribs) 15:39, 21 May 2009 (UTC)

Shouldn't P be positive definite? Shouldn't it be "unobserved subspace for the pair (A, C)"?