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math.QA2008
From quantum electrodynamics to posets of planar binary trees
Frédéric Chapoton, Alessandra Frabetti
This paper is a brief mathematical excursion which starts from quantum electrodynamics and leads to the Moebius function of the Tamari lattice of planar binary trees, within the fr…
math-ph2008
Renormalization Hopf algebras and combinatorial groups
Alessandra Frabetti
These are the notes of five lectures given at the Summer School {\em Geometric and Topological Methods for Quantum Field Theory}, held in Villa de Leyva (Colombia), July 2--20, 200…