Comments on "extreme point results for robust stabilization of interval plants with first order compensators"

The authors point out a simple alternative proof of the main result (Theorem 1) of the paper by Barmish, Hollot, Kraus, and Tempo (1992). This proof follows immediately on applying the vertex result of Hollot and Yang (1990) to the generalization of Kharitonov´s Theorem given by Chapellat and Bhattacharyya (1988, 1989). The authors also point out that more general vertex results are known.<>