Abstract
Etale groupoids play a central role in the theory of foliations. Well-known examples include the Haefliger groupoid Γq which classifies C ∞-foliations of codimension q [H71] and the holonomy groupoid of any foliation [W83]. In particular, invariants of leaf spaces of foliations are usually defined in terms of the classifying space or the C*-algebra associated to this holonomy groupoid (see [C, H84, Mo, BN] and many others).
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To P. Molino, on the occasion of his 6th birthday
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Moerdijk, I. (1997). On the Weak Homotopy Type of Étale Groupoids. In: Albert, C., Brouzet, R., Dufour, J.P. (eds) Integrable Systems and Foliations. Progress in Mathematics, vol 145. Birkhäuser Boston. https://doi.org/10.1007/978-1-4612-4134-8_8
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DOI: https://doi.org/10.1007/978-1-4612-4134-8_8
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