Composition of Weakly Nonlinear Time Invariant Systems

When building large systems, it’s common to construct them by combining smaller subsystems. To gain the ability to investigate such systems, in this section we study the fundamental operation of Systemcascadecascading two systems, that is, of connecting the output of one system to the input of another one. In our treatment we are going to assume that this connection doesn’t change the behavior of the involved systems. This is not always the case. Therefore, before applying what follows, we must carefully ponder this aspect.