qChapter 14 treats H¥ control with some simplified assumptions: R1=I, R2=I, D12*C1=0, and B1D21*=0. We show that there exists an
admissible controller such that ||Tzw||¥ <g if and only if the
following three conditions hold:
q (i) H¥ Îdom(Ric) and X¥ :=Ric(H¥)>0, where
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q (ii) J¥ Îdom(Ric) and Y¥ :=Ric(J¥)>0, where
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q (iii) r(X¥Y¥)< g2.