Factorization in quantum field theory: an exercise in Hopf algebras and local singularities
arXiv:hep-th/0306020
Abstract
I discuss the role of Hochschild cohomology in Quantum Field Theory with particular emphasis on Dyson--Schwinger equations.
20 p., Contributed to "Frontiers in Number Theory, Physics and Geometry", Les Houches, March 2003 (minor typos corrected)