H-infinity methods in control theory
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or H infinity is a method for the design of optimal controler.
(please explain here the theory)
Essentially is an optimization method that take in consideration strong mathematical definition of the restrictions on the expected behaviour of the closed loop and the strict stability of it. It is very appreciated due of his strong mathematical foundation. The mathematical way to express engineering aspects, it optimization/optimatility aspect and the it can include clasic and robust control concepts.
The "H" stand for Hardy Space.