Dear all,
I am glad to announce the finishing of chapter 6 of the ECE textbook. It describes ECE2 theory and the important application of Beltrami solutions.
Both subjects were introduced differently by Myron. Here I tried to present the subjects in analogy to prior ECE theory so that the textbook has a unified style and is easier to read. So the presentation has less “fiery” originality but is mathematically more stringent.