Comments on "State-Feedback Control of Fuzzy Discrete-Event Systems

The above paper considers the state-feedback control problem of fuzzy discrete-event systems (DESs) (FDESs) and gives a necessary and sufficient condition for the existence of a state-feedback controller. In this correspondence paper, after indicating that the problem under consideration is applicable for general DESs, not limited to FDESs, we show that the condition given in the above paper is not necessary by a counterexample and then provide a necessary and sufficient condition for the existence of a state-feedback controller.