Abstract
In this paper we present an elementary proof of a classical sufficient condition for free problems in the calculus of variations using an extension of the direct sufficiency method, originating in the work of G. Leitmann (Int. J. NonLin. Mech. 2, 55–59 (1967)), found in D.A. Carlson (J. Optim. Theory Appl. 114, 345–362 (2002)).
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Carlson, D.A., Leitmann, G. Fields of extremals and sufficient conditions for the simplest problem of the calculus of variations. J Glob Optim 40, 41–50 (2008). https://doi.org/10.1007/s10898-007-9171-z
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DOI: https://doi.org/10.1007/s10898-007-9171-z