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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

10 citations

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gr-qc2002★ 2 cited

What `shape' is space-time?

Timothy Porter

Some examples from the mathematics of shape are presented that question some of the almost hidden assumptions behind results on limiting behaviour of finitary approximations to spa…