
Journal of Convex Analysis 08 (2001), No. 1, 223240 Copyright Heldermann Verlag 2001 Self Dual Operators on Convex Functionals; Geometric Mean and Square Root of Convex Functionals Marc Atteia IREM, Université Paul Sabatier, 118 Route de Narbonne, 31062 Toulouse, France Mustapha Raïssouli Dép. de Mathématiques et Informatique, Faculté des Sciences, Université Moulay Ismail, 4010 Zitoune Meknès, Marocco Let Conv(X) be the set of the convex functionals defined on a linear space X, with values in the union of R and the point of positive infinity. We give an extension of the notion of duality for (convex) functionals to mappings which operate from Conv(X) × Conv(X) into Conv(X). Afterwards, we present an algorithm which associates, under convenient assumptions, a selfdual operator to a given operator and its dual. Finally, we give some examples which prove the generality and interest of our approach. [ Fulltextpdf (596 KB)] 