Removable singularities in the boundary conditions
On a linear hyperbolic equation with smooth coefficients without solutions
An example of a locally unsolvable hyperbolic equation of the second order is constructed, which has smooth () coefficients, but has no solutions in the class of distributions.
Sur des estimations des valeurs propres d'opérateurs elliptiques
Sur un exemple d'équation linéaire hyperbolique n'ayant pas de solution
Spectre négatif d'un opérateur elliptique avec des conditions au bord de Robin.
In this article we discuss some estimates of the number of the negative eigenvalues and their moments of energy for an elliptic operator L = L - V(x) defined in H(R ) with the Robin boundary conditions containing a potential W(x), in terms of some integrals of V and W.
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