(objectives)
THE COURSE OFFERS AN INTRODUCTION TO THE METHODS OF FIELD THEORY APPLIED TO THE STUDY OF MANY BODY SYSTEMS IN THE PHYSICS OF MATTER. ESPECIALLY IT WILL BE DEVELOPED THE PERTURBATIVE THEORY FOR THE ELECTRON GAS WITH USE OF THE GREEN FUNCTIONS AND FEYNMAN DIAGRAMS. IN THE SECON PART THE THEORETICAL STUDIES OF LOW TEMPERATURE PHENOMENA AS SUPERFLUIDITY AND SUPERCONDUCTIVITY WILL BE INTRODUCED .
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