Hello Physics Forum I will be taking a quantum field theory course next semester. I bought Mandl's book and Zee's book and looked them a bit. I have also been talking to others that have taken the class in previous semesters. I have a general idea of the failings of nonrelativistic quantum mechanics and therefore the need for QFT. Here's my comment and question. I have asked those that have taken the class previously to summarize QFT for me. I encountered huge resistance to doing so. So in dismay I pointed out to my fellow students of physcis that the fundamental principals of classical mechanics, electrodynamics, equilibrium statistical, special relativity and nonrelativistic QM can each be given concisely in a page or two. So what are the axioms or basic premises of QFT? OK, I have heard online that it has not, so far, been possible to give such axioms but why? Can somebody clear this up for me. Why does QFT appear to be such a morass?