Differenziabilità delle funzioni convesse a valori in spazi di successioni
Discontinuous wave equations and a topological degree for some classes of multi-valued mappings
The Leray-Schauder degree is extended to certain multi-valued mappings on separable Hilbert spaces with applications to the existence of weak periodic solutions of discontinuous semilinear wave equations with fixed ends.
Distributions I. Lagrangiennes
Dynamische Systeme und isolierte Singularitäten.