Robust stability of linear time invariant systems represented by an interval matrix

We describe sufficient conditions to guarantee the robust stability of a continuous linear time invariant system and the stability of a discrete linear time invariant system. The systems contain parametric uncertainty which is represented by an interval matrix. We have to know only the bound /spl alpha/ (for continuous systems) and the dependency of the Hermitian parts of C/sub 0/ and D matrices. The bound /spl beta/ (for the discrete case) depends on the Hermitian and skew-Hermitian parts of C/sub 0/ and D.