159 citations · 844 across the 56 of their papers we have counts for
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math-ph1999★ 37 cited
On the Connes-Kreimer construction of Hopf Algebras
I. Moerdijk
We give a universal construction of families of Hopf -algebras for any Hopf operad . As a special case, we recover the Connes-Kreimer Hopf algebra of rooted trees.
math.KT1999★ 1 cited
A Homology Theory for Etale Groupoids
Marius Crainic, Ieke Moerdijk
Etale groupoids arise naturally as models for leaf spaces of foliations, for orbifolds, and for orbit spaces of discrete group actions. In this paper we introduce a sheaf homology…