Consider an arbitrary linear time invariant discrete event system (DES). Theoretically, the input-output aquation of this DES can always be determined. In fact, it is often only known the impluse response, i.e. how the syste response an impulse given to it. Therefore, the system matrices A, B, and C need to be determined first. This is called realization for impulse response of the system. This system matrices then can be used to determine the input-output equation of considered DES. We will discuss about the realization existence condition for impulse response of linear time invariant DES and the algorithm to construct it. As teh results, it will be shown that the existence of realization depennds on the ultimately periodic property of the...