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Soient un anneau de germes de fonctions analytiques, le -module de formes différentielles à coefficients dans , et un endomorphisme de . On veut trouver les formes exactes telles que le soit aussi. On suppose deux conditions supplémentaires vérifiées : les valeurs propres de sont distinctes dans , et la torsion de Nijenhuis s’annule. Dans ces conditions il y a une décomposition de en somme directe, étant engendré par les formes propres dont les valeurs propres sont constantes,...
Let be an -dimensional Riemannian manifold admitting a covariant constant endomorphism of the localized module of 1-forms with distinct non-zero eigenvalues. After it is shown that is locally flat, a manifold immersed in is studied. The manifold has an induced structure with of the same eigenvalues if and only if the normal to is a fixed direction of . Finally conditions under which is invariant under , is totally geodesic and the induced structure has vanishing Nijenhuis...
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