a Instituto de Matemática Pura e Aplicada, Estrada Dona Castorina 110, Jardim Botânico, Rio de Janeiro, Brazil b University of Avignon, Department of Mathematics, 33 rue Louis Pasteur, 84000 Avignon, France
Abstract:
Let K be a closed convex cone in a Hilbert space X. Let BX be the closed unit ball of X and K•=(BX+K)∩(BX−K). The normality index