Mathematics – Algebraic Topology
Scientific paper
2011-01-25
Mathematics
Algebraic Topology
Scientific paper
We prove an extension of the Quillen Theorem Bn for homotopy fibres to a
similar result for homotopy pullbacks and use this to obtain sufficient
conditions on a pullback diagram of categories to guarantee that it be a
homotopy pullback.
Barwick Clark
Kan D. M.
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