Dimensional Renormalization. - A New Approach to Divergent Integrals. - Branching Equations of I and II Type and Their Connections with Finite Equations of Motion and the Callan-Symanzik Equation. - Nelson's Symmetry at Work: The Infinite Volume Behavior of the Vacuum for Two-Dimensional Self-Coupled Bose Fields. - Path Integrals and Gauge Theories. - Renormalizable Models with Broken Symmetries. - Group Theoretical Approach to Conformal Invariant Quantum Field Theory. - Use of Invariant Transformations in Problems of Superconductivity. - Analytic Renormalization of the a-Model. - Recent Progress on Computational Methods in Field Theory. - Short Review of Small-Distance-Behaviour Analysis. - Diagrammar and Dimensional Renormalization. - Quantum Gravity as a Gauge Field Theory. - Self-Consistent Quantum Field Theory and Symmetry Breaking. - The Present Status of the Computing Methods in Quantum Electrodynamics. - Relativistic Strings and Supergauges. - Application of Gauge Theories to Weak and Electromagnetic Interactions. Language: English