Geodesic
Orbit projections of proper Lie groupoids as fibrations
Czechoslovak Mathematical Journal, Tome 59 (2009) no. 3, pp. 591-594.

Voir la notice de l'article provenant de la source Czech Digital Mathematics Library

Let $\mathcal{G} \rightrightarrows M$ be a source locally trivial proper Lie groupoid such that each orbit is of finite type. The orbit projection $M \to M/\mathcal{G}$ is a fibration if and only if $\mathcal{G}\rightrightarrows M$ is regular.
Classification : 22A22, 55R05, 55R65
Keywords: orbit projection; proper Lie groupoid; fibration 
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     author = {Rainer, Armin},
     title = {Orbit projections of proper {Lie} groupoids as fibrations},
     journal = {Czechoslovak Mathematical Journal},
     pages = {591--594},
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     zbl = {1224.22005},
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     url = {http://geodesic.mathdoc.fr/item/CMJ_2009__59_3_a2/}
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Rainer, Armin. Orbit projections of proper Lie groupoids as fibrations. Czechoslovak Mathematical Journal, Tome 59 (2009) no. 3, pp. 591-594. http://geodesic.mathdoc.fr/item/CMJ_2009__59_3_a2/