230 citations · 330 across the 6 of their papers we have counts for
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math.QA2008★ 8 cited
Groupoidification Made Easy
John C. Baez, Alexander E. Hoffnung, Christopher D. Walker
Groupoidification is a form of categorification in which vector spaces are replaced by groupoids, and linear operators are replaced by spans of groupoids. We introduce this idea wi…
math.AT2008
The Classifying Space of a Topological 2-Group
John C. Baez, Danny Stevenson
Categorifying the concept of topological group, one obtains the notion of a 'topological 2-group'. This in turn allows a theory of 'principal 2-bundles' generalizing the usual theo…