Interactions totalement non linéaires
Introduction à l’invariant
Invariant Pseudo-Differential Operators.
Isomorphismes entre algèbres d'opérateurs pseudo-différentiels
Isoperimetric constants and the first eigenvalue of a compact riemannian manifold
K-theory of Boutet de Monvel's algebra
We consider the norm closure 𝔄 of the algebra of all operators of order and class zero in Boutet de Monvel's calculus on a compact manifold X with boundary ∂X. Assuming that all connected components of X have nonempty boundary, we show that K₁(𝔄) ≃ K₁(C(X)) ⊕ ker χ, where χ: K₀(C₀(T*Ẋ)) → ℤ is the topological index, T*Ẋ denoting the cotangent bundle of the interior. Also K₀(𝔄) is topologically determined. In case ∂X has torsion free K-theory, we get K₀(𝔄) ≃ K₀(C(X)) ⊕ K₁(C₀(T*Ẋ)).
La propriété de transmission pour les distributions de Fourier ; application aux lacunes
La série discrète de et les opérateurs pseudo-différentiels sur une demi-droite
Le résidu non commutatif
Littlewood-Paley decompositions on manifolds with ends
For certain non compact Riemannian manifolds with ends which may or may not satisfy the doubling condition on the volume of geodesic balls, we obtain Littlewood-Paley type estimates on (weighted) spaces, using the usual square function defined by a dyadic partition.
Localization and wave fronts
Maximally degenerate laplacians
The Laplacian of a compact Riemannian manifold is called maximally degenerate if its eigenvalue multiplicity function is of maximal growth among metrics of the same dimension and volume. Canonical spheres and CROSSes are MD, and one asks if they are the only examples. We show that a MD metric must be at least a Zoll metric with just one distinct eigenvalue in each cluster, and hence with all band invariants equal to zero. The principal band invariant is then calculated in terms of geodesic...
Microdistributions de Fourier classiques dans le cadre analytique réel
On étudie une classe de microdistributions intégrales de Fourier représentées à l’aide de phases homogènes analytiques réelles, d’amplitudes qui sont des réalisations holomorphes tronquées de symboles analytiques classiques, et de contours d’intégration le long desquels la partie imaginaire de la phase a une propriété convenable de positivité. On donne des théorèmes de changement de phase et de composition transverse analogues à ceux du cas , et on montre comment le calcul symbolique standard des...
Microlocal energy methods and pseudo-differential operators.
Nets on a Riemannian manifold and finite-dimensional approximations of the Laplacian [Book]
Nombre de points entiers dans une famille homothétique de domaines de
On a class of nonlocal elliptic operators for compact Lie groups. Uniformization and finiteness theorem
We consider a class of nonlocal operators associated with an action of a compact Lie group G on a smooth closed manifold. Ellipticity condition and Fredholm property for elliptic operators are obtained. This class of operators is studied using pseudodifferential uniformization, which reduces the problem to a pseudodifferential operator acting in sections of infinite-dimensional bundles.
On a Class of Pseudodifferential Operators with Double Characteristics.
On global hypoellipticity of vector fields
On Pseudo-Differential Operators and Smoothness of Special Lie-Group Representations.