On définit la notion de volume dans un espace feuilleté. Si est une feuille compacte, alors toute feuille rencontrant un petit voisinage de a un volume très grand, ou sinon un volume qui est approximativement un multiple entier du volume de . Si toutes les feuilles sont compactes il y a trois objets apparentés à étudier. Premièrement la topologie de l’espace des feuilles ; puis l’holonomie des feuilles ; enfin il s’agit de savoir si les feuilles ont un volume localement borné. Nous établissons diverses implications entre ces concepts et nous donnons des exemples. Nous démontrons un résultat énoncé par Ehresmann, et publié sans démonstration : dans une variété feuilletée, si une feuille compacte a des voisinages saturés arbitrairement petits, alors l’holonomie de cette feuille est finie.
The notion of the “volume" of a leaf in a foliated space is defined. If is a compact leaf, then any leaf entering a small neighbourhood of either has a very large volume, or a volume which is approximatively an integral multiple of the volume of . If all leaves are compact there are three related objects to study. Firstly the topology of the quotient space obtained by identifying each leaf to a point ; secondly the holonomy of a leaf ; and thirdly whether the leaves have a locally bounded volume. We prove various implications relating these concepts and we also give some counterexamples. We give a proof of the result, published by Ehresmann without proof, that in a foliated manifold, if a compact leaf has arbitrarily small neighbourhoods, which are saturated by the leaves, then its holonomy is finite.
@article{AIF_1976__26_1_265_0,
author = {Epstein, D. B. A.},
title = {Foliations with all leaves compact},
journal = {Annales de l'Institut Fourier},
volume = {26},
year = {1976},
pages = {265-282},
doi = {10.5802/aif.607},
mrnumber = {54 \#8664},
zbl = {0313.57017},
language = {en},
url = {http://dml.mathdoc.fr/item/AIF_1976__26_1_265_0}
}
Epstein, D. B. A. Foliations with all leaves compact. Annales de l'Institut Fourier, Tome 26 (1976) pp. 265-282. doi : 10.5802/aif.607. http://gdmltest.u-ga.fr/item/AIF_1976__26_1_265_0/
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