BACK TO THE ROBUST PERFORMANCE PROBLEM
The Main Loop Theorem is introduced in the particular context of a robust performance problem. Note that this Theorem has been widely
used in many other contexts, and that it is the basis of many existing // results.
MAIN LOOP THEOREM
The standard interconnection structure M — A of Figure 1.11 is here again considered. The mixed model perturbation Д is split into two mixed model perturbations Д i and Д2:
Let Д і = 0 and Fi( M, Д2) the transfer between w and z on Figure 1.13. The following result is known as the Main Loop Theorem: