Galoitica: Journal of Mathematical Structures and Applications GJMSA 2834-5568 10.54216/GJSMA https://www.americaspg.com/journals/show/1511 2022 2022 A Short Note on Some Observable Outputs of Some Linear Discrete Time Systems Umm Al-Qura Univerity, Mekka, Saudi Arabia Khadija Ben Othman   In this paper, we study the problem of controllable and observable output of the type:     On the other hand, we present some new result about the formula of this linear discrete-time system and about controllable out put   2023 2023 25 28 10.54216/GJMSA.030104 https://www.americaspg.com/articleinfo/33/show/1511