*L*^{∞}-error estimate for a discrete two-sided obstacle problem and multilevel projective algorithm

## (*Lobachevskii Journal of Mathematics, Volume XXIV*)

Using the notion of radially Clarke-Rockafellar subdifferentiable
functions (*RCRS*-functions), we characterize strictly pseudoconvex
functions with respect to the Clarke-Rockafellar subdifferential
in two different ways, and we study a maximization problem
involving RCRS-strictly pseudoconvex functions over a convex set.