Lectures on Quantum Field Theory

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The material presented encompasses a two-semester course in quantum field theory taught by the author for over two decades at Charles University and Czech Technical University in Prague. It explores selected topics in relativistic quantum mechanics and quantum field theory, with a primary focus on quantum electrodynamics. Detailed discussions include Feynman diagrams, regularization, and renormalization methods, along with fundamental applications. The chosen topics aim to equip readers with the technical skills essential for further studies in theoretical particle physics. The text features numerous explicit calculations that are less common in other sources, reflecting the content of the author's lectures. While primarily intended for university students specializing in theoretical physics or nuclear and particle physics, the work is also valuable for any scientifically-minded reader interested in the foundations of modern physics. The book was published in collaboration with Karolinum Press of Charles University.