If f, g F(X) are convex, then f + g is convex f is
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• f + g is convex
• αf is convex for every α ≥ 0
Therefore the set of convex functions on a set X is a cone in F(X). Moreover, if f is strictly convex, then
• f + g is strictly convex
• αf is strictly convex for every α > 0
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