On smooth variational principles in Banach spaces
A new variational principle in Banach spaces admitting Fréchet differentiable bump functions is given (Theorem 1.1). As an application, some refinements of the Borwein-Preiss variational principle are obtained. The first principle of this nature is the well-known variational principle of Ekeland in 1974.
scientific article; zbMATH DE number 902433