159 citations · 844 across the 56 of their papers we have counts for
5 papers · 1 filter
Introduction to the language of stacks and gerbes
Ieke Moerdijk
This is an introduction to gerbes for topologists, with emphasis on non-abelian cohomology.
The renormalisation bialgebra and operads
Pepijn van der Laan, Ieke Moerdijk
In a recent preprint, Brouder and Schmitt give a careful construction of a `renormalisation' Hopf algebra out of an arbitrary bialgebra. In this note, we point out that this is a s…
Axiomatic homotopy theory for operads
Clemens Berger, Ieke Moerdijk
We give sufficient conditions for the existence of a model structure on operads in an arbitrary symmetric monoidal model category. General invariance properties for homotopy algebr…
Orbifolds as Groupoids: an Introduction
Ieke Moerdijk
This is a survey paper based on my talk at the Workshop on Orbifolds and String Theory, the goal of which was to explain the role of groupoids and their classifying spaces as a fou…
On the Classification of Regular Groupoids
I. Moerdijk
We observe that any regular Lie groupoid G over an manifold M fits into an extension of a foliation groupoid E by a bundle of connected Lie groups K. If $\FF$ is th…