-harmonic maps which map the boundary of the domain to one point in the target.
-manifolds and integrable systems of hydrodynamic type
We investigate the role of Hertling-Manin condition on the structure constants of an associative commutative algebra in the theory of integrable systems of hydrodynamic type. In such a framework we introduce the notion of -manifold with compatible connection generalizing a structure introduced by Manin.
Facilitating the Adoption of Unstructured High-Order Methods Amongst a Wider Community of Fluid Dynamicists
Theoretical studies and numerical experiments suggest that unstructured high-order methods can provide solutions to otherwise intractable fluid flow problems within complex geometries. However, it remains the case that existing high-order schemes are generally less robust and more complex to implement than their low-order counterparts. These issues, in conjunction with difficulties generating high-order meshes, have limited the adoption of high-order...
Factor spaces and implications of Kirchhoff equations with clamped boundary conditions.
Factorization of matrix-functions and regularization of singular integral operators on manifolds with boundary.
Factorization of operators and weighted norm inequalities
Failure of analytic hypoellipticity in a class of differential operators
For the hypoelliptic differential operators introduced by T. Hoshiro, generalizing a class of M. Christ, in the cases of and left open in the analysis, the operators also fail to be analytic hypoelliptic (except for ), in accordance with Treves’ conjecture. The proof is constructive, suitable for generalization, and relies on evaluating a family of eigenvalues of a non-self-adjoint operator.
Failure of convergence of the Lax-Oleinik semi-group in the time periodic case
Faisceaux constructibles et systèmes holonomes d'équations aux dérivées partielles linéaires à points singuliers réguliers
Faisceaux d'espaces de Sobolev et principes du minimum
On montre que le faisceau des sursolutions locales dans d’un certain opérateur elliptique est maximal pour un principe du minimum adapté aux espaces de Sobolev. La continuité de la réduite variationnelle des éléments continus permet alors d’étudier des représentants s.c.i.
Faisceaux maximaux de fonctions associées à un opérateur elliptique du second ordre
Soit le faisceau des sursolutions variationnelles d’un opérateur différentiel elliptique du second ordre à coefficients . Soit le faisceau des régularitées essentielles inférieures des éléments de . On démontre que est contenu dans un seul préfaisceau maximal de cônes convexes de fonctions s.c.i. vérifiant le principe du minimum sur une base d’ouverts suffisamment petits. On démontre que possède toutes les bonnes propriétés d’une théorie locale du potentiel.
Families of differential forms on complex spaces
On every reduced complex space we construct a family of complexes of soft sheaves ; each of them is a resolution of the constant sheaf and induces the ordinary De Rham complex of differential forms on a dense open analytic subset of . The construction is functorial (in a suitable sense). Moreover each of the above complexes can fully describe the mixed Hodge structure of Deligne on a compact algebraic variety.
Familles de branches de bifurcations dans les équations de Ginzburg-Landau
Familles de convexes invariantes et équations de diffusion-réaction
Pour localiser la solution d’un système de diffusion-réaction, il suffit de construire une famille de convexes , invariante par rapport au champ de vecteurs associé à ce système; la solution est alors incluse dans à l’instant dès qu’elle est contenue dans à l’instant zéro. Les fonctions d’appui associées à de telles familles de convexes sont solutions d’un système différentiel, mais celui-ci peut également engendrer des familles non invariantes.
Fast and heteroclinic solutions for a second order ODE.
Fast convergence of the Coiflet–Galerkin method for general elliptic BVPs
Fast convergence of the Coiflet-Galerkin method for general elliptic BVPs
We consider a general elliptic Robin boundary value problem. Using orthogonal Coifman wavelets (Coiflets) as basis functions in the Galerkin method, we prove that the rate of convergence of an approximate solution to the exact one is O(2−nN ) in the H 1 norm, where n is the level of approximation and N is the Coiflet degree. The Galerkin method needs to evaluate a lot of complicated integrals. We present a structured approach for fast and effective evaluation of these integrals via trivariate connection...
Fast multigrid solver
In this paper a black-box solver based on combining the unknowns aggregation with smoothing is suggested. Convergence is improved by overcorrection. Numerical experiments demonstrate the efficiency.
Fast Poisson Solvers on General Two Dimensional Regions for the Dirichlet Problem.
Fast solution of periodic integral equations by GMRES.