[en] The subject is covered in chapters, entitled: weak interactions and vector mesons; photons; Yang-Mills field; spontaneous breaking of symmetries; spontaneous breaking of local gauge symmetries; topology and symmetry-breaking; theory of leptons; provisional model of hadron weak interactions; Feynman's path-integral formulation of quantum mechanics; quantization of gauge fields; Ward-Takahashi identities; regularization and anomalies; renormalization of gauge theories; symmetry-breaking and mass-differences; higher-order corrections; CP and T violation; gauge theories and strong interactions. (U.K.)