Volterra series

The Volterra series is a mathematical way to model complex systems that have nonlinear behavior, meaning their output isn't directly proportional to their input. It breaks down the system's response into multiple layers or terms, each representing different degrees of interaction within the system. Think of it as a detailed recipe that describes how various input components combine to produce the output, capturing both simple and intricate relationships. This approach is useful in fields like signal processing and control systems to predict how a system will react to different inputs with high accuracy.