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Nous étudions les métriques riemanniennes holomorphes sur les variétés complexes
compactes de dimension . Nous montrons que, contrairement au cas réel, une métrique
riemannienne holomorphe possède un “grand” pseudo-groupe d’isométries locales. Ceci
implique qu’une telle métrique n’existe pas sur les variétés complexes compactes
simplement connexes de dimension .
Existence and uniqueness theorems for weak solutions of a complex Monge-Ampère equation are established, extending the Bedford-Taylor pluripotential theory. As a consequence, using the Tian-Yau-Zelditch theorem, it is shown that geodesics in the space of Kähler potentials can be approximated by geodesics in the spaces of Bergman metrics. Motivation from Donaldson’s program on constant scalar curvature metrics and Yau’s strategy of approximating Kähler metrics by Bergman metrics is also discussed....
In this article we give an obstruction to integrability by quadratures of an ordinary differential equation on the differential Galois group of variational equations of any order along a particular solution. In Hamiltonian situation the condition on the Galois group gives Morales-Ramis-Simó theorem. The main tools used are Malgrange pseudogroup of a vector field and Artin approximation theorem.
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