The term system has already been introduced in section 1.1. A system is classified as follows:
Let us introduce the above terms one by one.
If the output of a continuous time system depends only on the present input and not on the past or future input, the system is known as a static system. There cannot be any energy storage elements like a capacitor and an inductor are static systems. Therefore, we can say that a static system is a system without a memory.
On the other hand, if the output of a system depends on the present as on the well as past values of inputs, ...