Displaying similar documents to “Une note sur les fonctions invariantes”

Sur l'holonomie des variétés pseudo-riemanniennes de signature (2,2+n).

A. Ikemakhen (1999)

Publicacions Matemàtiques

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In this paper, we determine a class of possible restricted holonomy groups for a non-irreducible indecomposable pseudoriemannian manifold with signature (2,2 + n). In particular, we deduce that which associated to symmetric spaces; and give some examples of such spaces. Finally, we construct some examples of metrics whose restricted holonomy groups are not closed.

Une caractérisation du fibré transverse.

Tong Van Duc (1990)

Collectanea Mathematica

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We prove that the Lie algebra of infinitesimal automorphisms of the transverse structure on the total space of the transverse bundle of a foliation is isomorphic to the semi-direct product of the Lie algebra of the infinitesimal automorphism of the foliation by the vector space of the transverse vector fields. The derivations of this algebra are entirely determined and we prove that this Lie algebra characterises the foliated structure of a compact Hausdorff foliation.