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most citedThe fundamental groupoid of the quotient of a Hausdorff space by a discontinuous action of a discrete group is the orbit groupoid of the induced action

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math.AT2006★ 6 cited

Normalisation for the fundamental crossed complex of a simplicial set

Ronald Brown, Rafael Sivera

Crossed complexes are shown to have an algebra sufficiently rich to model the geometric inductive definition of simplices, and so to give a purely algebraic proof of the Homotopy A…