We show that,in general,Clarke critical points of C1-0 (i.e,locally Lipschitz) function-als in Banach spaces do not possess the invariance property under C1-0 local coordinatetransformations. We then introduce the concept of the essentially critical points of C1-0 functionals,which can be used to study C1-0 functions on C1-0 manifolds.We obtainsome results related to the essentially critical points. |