Exploració per tema "Perturbative methods of renormalisation"
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Groupoids and Faà di Bruno formulae for Green functions in bialgebras of trees
(2014)
Article
Accés restringit per política de l'editorialWe prove a Faà di Bruno formula for the Green function in the bialgebra of P-trees, for any polynomial endofunctor P. The formula appears as relative homotopy cardinality of an equivalence of groupoids.