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20022009
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.CT2009★ 3 cited

`Double modules', double categories and groupoids, and a new homotopical double groupoid

Ronald Brown

We give a rather general construction of double categories and so, under further conditions, double groupoids, from a structure we call a `double module'. We also give a homotopica…