Noncommutative signal-flow graph

Noncommutative signal-flow graphs are graphs that show how signals (like waves or energy) flow between different parts of a system. The graph shows how the signals are connected and how they affect each other. The term "noncommutative" means that the order in which things happen matters, so if you change the order, the signals will flow differently. For example, imagine that you have two parts in a system, A and B. A is connected to B with a noncommutative signal-flow graph. If A sends a signal to B first and then B sends a signal back to A, the system will behave differently than if B sent a signal to A first and then A sent a signal back to B.