activity
19992004
most citedIntroduction to the language of stacks and gerbes

56 citations · 71 across the 4 of their papers we have counts for

collaborators
Showing 1999Show all

2 papers · 1 filter

math-ph1999

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

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…