If you have a mathematical level Master (post graduate) and if you want to know ALL the quantum field theory, this book is for you; A book Zee (quantum field theory in a nutshell) st by itself exceptional, but it allows you to then read Zee; it is an absolute masterpiece; not only everything is clear, but the notations are clear progression remarkably thinking, completely treated examples are a marvel to say nothing of humor of the author; Obviously the title tells it; it does not go as far as Weinberg (MONUMENTAL) or that "A touristic guide for mathematicians" G Folland but this book that of Zee + + that of Folland, frankly these authors deserve a prize; Start by Tom Lancaster, you will not regret it; English Comments are the same barrel as mine but I do not have to force me; I have NEVER in my life read anything of the kind; it is the honor of the human race; a big thank you to the author! I'm not talking thoughtful all exercises and of medium difficulty for an amateur not very good. As I am one; but any student in theoretical physics MUST have this book to the point of being able to include in the night and I venture to think that this applies to ALL students in math after the First Round it goes without saying otherwise it will abut on technique supposedly so everything is intuitive and rigorous and will be blocked. We see physical after reading another way and also the math; hat!