Compacité par compensation : condition nécessaire et suffisante de continuité faible sous une hypothèse de rang constant
Comportement asymptotique de la fonction spectrale de l'opérateur de Laplace-Beltrami sur une variété ayant des singularités coniques
Computing exact solutions to a generalized Lax-Sawada-Kotera-Itô seventh-order KdV equation.
Conditions ensuring T-1(Y) ⊂ Y.
The following theorem is the main result of the paper: Let X be a complex Banach space and T belong to L(X). Suppose that 0 lies at the unbounded component of the set of those l such that lI - T is a Fredholm operator. Let Y be a dense subspace of the dual space X' and S be a closed operator from Y to X such that T'(Y) is contained in Y and TSy = ST'y for every y belonging to Y. Then for every vector x belonging to X', T'x belongs to Y if and only if x belongs to Y.
Correspondance de -modules et transformation de Penrose