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math.QA2004★ 9 cited
The Hopf algebra structure of multiple harmonic sums
Michael E. Hoffman
Multiple harmonic sums appear in the perturbative computation of various quantities of interest in quantum field theory. In this article we introduce a class of Hopf algebras that…
math.CO2004
Updown Categories
Michael E. Hoffman
A poset can be regarded as a category in which there is at most one morphism between objects, and such that at most one of Hom(c,c') and Hom(c',c) is nonempty for c not equal to c'…