If f is convex on R F(x1 - x2 + x3) f(x1) - f(x2) + f(x3)
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F(x1 - x2 + x3) ≤ f(x1) - f(x2) + f(x3)
for every x1 ≤ x2 ≤ x3 ∈ R. The inequality is strict if f is strictly convex and reversed if f is concave.
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