Anomalous Threshold as the Pivot of Feynman Amplitudes
arXiv:0807.0698 · doi:10.1016/j.nuclphysbps.2008.09.124
Abstract
Reduction techniques, Landau singularities and differential equations for Feynman amplitudes are briefly reviewed.
Contribution to the Proceedings of the 9th DESY workshop on "Loops and Legs in Quantum Field Theory", Sondershausen, April 2008. 6 pages latex,