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Twice Differentiable Characterizations of Convexity Notions for Functions on Full Dimensional Convex Sets

Stein O.

Schedae Informaticae

2012

Vol. 21

55--63

We derive C2-characterizations for convex, strictly convex, as well as strongly convex functions on full dimensional convex sets. In the cases of convex and strongly convex functions this weakens the well-known openness assumption on the convex sets. We also show that, in a certain sense, the full dimensionality assumption cannot be weakened further. In the case of strictly convex functions we weaken the well-known sufficient C2-condition for strict convexity to a characterization. Several examples illustrate the results.