This paper contains a
sufficiency theorem appropriate to applications of Hestenes’ method of multipliers. It
is a generalization of the lemma of Hahn, which has been used by previous
authors to prove variable end point sufficiency theorems. The classical and
control formulations of the problems of Mayer, Lagrange, and Bolza in both
parametric and nonparametric form are included. The method of proof is
indirect.