Now that we are in the discrete domain, we have to learn how to use it and what the consequences are. My love affair with signal processing began with the z transform. The concept of minimum phase originated in electrical engineering with respect to stability and I have no idea why it is so hidden in our book. It does, of course, appear, pages 603-609, but we need to do better. This subject is scattered throughout the book and I will attempt to synthesize this important topic.
Recursion is fundamental in data processing and in system modeling.
The seismic applications will be presented with reference to published work. Lathi has explored this topic, beautifully, for continuous systems in other books. Wiener received the Nobel prize for this work. He merits an introduction, at least. We may never get here.