Perturbation Theory and Techniques
arXiv:hep-th/0505139
Abstract
Prepared for the Quantum Field Theory section of the Encyclopedia of Mathematical Physics, Elsevier, 2006. A brief introduction to the methodology and techniques of perturbative relativistic quantum field theory is presented.
18 pages, 9 figures; v2: typos corrected; Contribution to the Encyclopedia of Mathematical Physics, Elsevier, 2006