qSolution: $ K such that ||Tzw||¥ < g if and only if
q(i) X¥ ³0
q X¥ A+A*X¥ +X¥ (B1B1*/g2-B2B2*)X¥+C1*C1=0
q(ii) Y¥ ³0
q AY¥ +Y¥ A*+Y¥ (C1*C1/g2-C2*C2)Y¥+B1 B1*=0
q(iii) r(X¥ Y¥ )< g2
qFurthermore,
q
qwhere A¥ :=A+B1B1*X¥/g2+B2F¥+ Z¥ L¥ C2
qF¥ :=-B2*X¥ , L¥ :=-Y¥ C2* , Z¥ =(I-Y¥X¥ /g2)-1
q