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This Problem Book is based on the exercises and lectures which I have given to undergraduate and graduate students of the Faculty of Physics, University of Belgrade over many years. Nowadays, there are a lot of excellent Quantum Field Theory textbooks. Unfortunately, there is a shortage of Problem Books inthis?eld,oneoftheexceptionsbeingtheProblemBookofChengandLi. The overlap between this Problem Book and  is very small, since the latter mostly deals with gauge ?eld theory and particle physics. Textbooks usually contain problems without solutions. As in other areas of physics doing more problems in full details improves both understanding and e?ciency. So, I feel that the absence of such a book in Quantum Field Theory is a gap in the literature. This was my main motivation for writing this Problem Book. To students: You cannot start to do problems without previous stu- ing your lecture notes and textbooks. Try to solve problems without using solutions; they should help you to check your results. The level of this Pr- lem Book corresponds to the textbooks of Mandl and Show ; Greiner and Reinhardt  and Peskin and Schroeder . Each Chapter begins with a short introduction aimed to de?ne notation. The ?rst Chapter is devoted to the Lorentz and Poincar' esymmetries. Chapters 2, 3 and 4 deal with the re- tivistic quantum mechanics with a special emphasis on the Dirac equation. In Chapter 5 we present problems related to the Euler-Lagrange equations and the Noether theorem.
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