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started an entry on the Borel construction, indicating its relation to the nerve of the action groupoid.
That is very useful and very ’timely’ as I was looking for a good reference for the Borel construction and orbifolds. :-)
added a subsection called
As a homotopy colimit over the category associated to $G$
This entry was lacking a decent reference. I have taken the liberty now of pointing to
Please feel invited to add you favorite classical textbook account on the Borel construction, instead (which is?)
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