Resumen de Two geometric constant for operators acting on a separable Banach space

Ana Plans, E. Martín, Alvaro Angel Rodés Usán , Esteban Induráin Eraso

• The main result of this paper is the following: a separate Banach space X is reflexive if and only if the infimum of the Gelfand numbers of any bounded linear operator defined on X can be computed by means of just one sequence of nested, closed, finite condimensional subspaces with null intersections.