Abstract
Second-order differential properties of an extremal-value function v are studied. It is shown that under certain assumptions (in particular the strong second-order sufficiency conditions) v is locally expressible as the maximum of a finite number of C2-functions. After removing the assumption of strong sufficiency lower and upper bounds on the second order local behaviour of v are proposed. The obtained results are applied to give second-order optimally conditions for a semi-infinite program.

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