qChapter 8 derives robust stability tests for systems under various modeling
assumptions through the use of the small gain theorem. In
particular, we show that a system shown below, with an
unstructured uncertainty D ÎRH¥ with ||D||¥ <1, is robustly stable if
and only if ||Tzw||¥ £1 , where Tzw is the
matrix transfer function from w to z.
q