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A Quillen theorem Bn for homotopy pullbacks
Published 25 Jan 2011 in math.AT and math.CT | (1101.4879v1)
Abstract: 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.
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