The following pages link to Bernard Helffer (Q171249):
Displaying 50 items.
- Unicité de Cauchy pour des opérateurs différentiels faiblement principalement normaux. (Cauchy uniqueness for principal normal differential operators) (Q1067087) (← links)
- Smoothness and analyticity for solutions of first order systems of partial differential equations on nilpotent Lie groups (Q1073273) (← links)
- On sufficient conditions for convergence of formal solutions (Q1080045) (← links)
- Removable singularities of real analytic solutions of Fuchsian partial differential equations (Q1080048) (← links)
- The wave equation for a hypoelliptic operator with symplectic characteristics of codimension two (Q1080088) (← links)
- Existenz- und Eindeutigkeitsbeweis zur Lösung des Goursat-Problems für quasilineare hyperbolische Systeme erster Ordnung mittels Differenzenverfahren. (Proof of existence and uniqueness of the solution of the Goursat problem for quasilinear hyperbolic s (Q1081026) (← links)
- Microlocal parametrices and propagation of singularities near gliding points for hyperbolic mixed problems. I (Q1089516) (← links)
- Regularity of solutions to the Schrödinger equation (Q1094619) (← links)
- Caractérisation du spectre essentiel de l'opérateur de Schrödinger avec un champ magnétique. (Characterization of the essential spectrum of the Schrödinger operator with a magnetic field) (Q1099394) (← links)
- On the propagation of analyticity for some class of differential equations with non-involutive double characteristics (Q1102434) (← links)
- Sur la multiplicité de la première valeur propre d'une surface de Riemann à courbure constante. (On the multiplicity of the first eigenvalue of a Riemannian surface of constant curvature) (Q1110108) (← links)
- On a conjecture of P. Jorgensen and W. Klink (Q1111082) (← links)
- Spectre du Laplacien, graphes et topologie de Fell. (Spectrum of the Laplacian, graphs and Fell topology) (Q1112408) (← links)
- Approximation d'un système de champs de vecteurs et applications à l'hypoellipticite (Q1139732) (← links)
- Comportement semi-classique du spectre des hamiltoniens quantiques elliptiques (Q1147891) (← links)
- Conditions necessaires d'hypoanalyticite pour des opérateurs invariants à gauche homogenes sur un groupe nilpotent gradue (Q1151510) (← links)
- A mathematical approach to the effective Hamiltonian in perturbed periodic problems (Q1180516) (← links)
- Space-time picture of semiclassical resonances (Q1193086) (← links)
- Sharp propagation estimates for \(N\)-particle systems (Q1196418) (← links)
- Counterexamples to analytic hypoellipticity for domains of finite type (Q1197343) (← links)
- Limiting absorption principle and resonances for the Dirac operator (Q1197395) (← links)
- Spectral approximation for elliptic boundary value problems (Q1202041) (← links)
- Pseudodifferential operators on groups with dilations (Q1202445) (← links)
- Asymptotic behavior of eigenvalues for a class of pseudodifferential operators on \({\mathbb{R}{}}^ n\) (Q1209674) (← links)
- Semi-classical analysis for the Schrödinger operator and applications (Q1210775) (← links)
- Sur une classe d'opérateurs partiellement hypoelliptiques (Q1212603) (← links)
- Sur une classe d'opérateurs hypoelliptiques à caractéristiques multiples (Q1213563) (← links)
- Invariants associés à une classe d'opérateurs pseudodifférentiels et applications à l'hypoellipticité (Q1215760) (← links)
- Addition de variables et application à la régularité (Q1241659) (← links)
- Construction de paramètrixes pour une nouvelle classe d'opérateurs pseudodifferentiels (Q1258871) (← links)
- Remarks on decay of correlations and Witten Laplacians Brascamp-Lieb inequalities and semiclassical limit (Q1266276) (← links)
- Stability of matter for the Hartree-Fock functional of the relativistic electron-positron field (Q1277783) (← links)
- On the correlation for Kac-like models in the convex case (Q1292121) (← links)
- Nodal sets for ground states of Schrödinger operators with zero magnetic field in non simply connected domains (Q1297669) (← links)
- On the stability of the relativistic electron-positron field (Q1299959) (← links)
- The log-Sobolev inequality for unbounded spin systems (Q1304657) (← links)
- Remarks on decay of correlations and Witten Laplacians. III: Application to logarithmic Sobolev inequalities (Q1304922) (← links)
- On hypoellipticity and solvability of linear partial differential operators with multiple characteristics (Q1309348) (← links)
- Asymptotics of the ground state energies of large Coulomb systems (Q1313180) (← links)
- An inverse Heisenberg inequality (Q1317297) (← links)
- Normal forms of real symmetric systems with multiplicity (Q1319090) (← links)
- Universal estimate of the gap for the Kac operator in the convex case (Q1320297) (← links)
- Analytic hypoellipticity, representations of nilpotent groups, and a nonlinear eigenvalue problem (Q1320636) (← links)
- On the Cauchy problem for Schrödinger type equations and Fourier integral operators (Q1323245) (← links)
- On a necessary condition for \(L^ 2\) well-posedness of the Cauchy problem for some Schrödinger type equations with a potential term (Q1323248) (← links)
- Around a stationary phase theorem in large dimension (Q1328347) (← links)
- The quasi-classical asymptotics of local Riesz means for the Schrödinger operator in a strong homogeneous magnetic field (Q1331681) (← links)
- Infinite systems of potential wells (Q1333781) (← links)
- Decay at infinity of eigenfunctions of Schrödinger operators with polynomial electro-magnetic field (Q1333798) (← links)
- Ferromagnetic integrals, correlations and maximum principles (Q1337039) (← links)
