Can anybody tell me how to calculate the H-infinity norm through freqency response?

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Am using a first order system with integrator (G=K/(s*(1+T*s)) with PID controller..I want to find the H-infinity norm of control effort U(s)=K(s)*S(S)....here S--> sensitivity function .. the H-inf norm value of the control effort (U) is inf...can anybody help me to find the H-infinity norm of the control effort...

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