ABSTRACT
In this chapter the main concepts related to robust control are introduced. In particular, the key notions of robustness and uncertainty are presented. In the formalization of uncertainty, both the structural and unstructured case are dealt with. In this preliminary part the representation of a linear time invariant system in term of the realization matrix is also given. Some examples of uncertainty generated with MATLAB examples are reported. The essential chronology of the recent history of robust control is also outlined.
