ON CLARKE-MITITELU SUBDIFFERENTIAL

Based on a generalization of the classical notion of differential, the subdifferential is a relatively new notion in Functional Analysis. It results in a natural way from the need for finding appropriate treatments of some classes of problems in Optimization Theory. The aim of this work is to survey the concept of subdifferential emphasizing the contribution of Professor S¸tefan Mititelu to the development of this field.