Prove corollary 5.1.1. If 1. x* is a stationary point of f, that is, f(x) = 0,
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If
1. x* is a stationary point of f, that is, ∇f(x) = 0, and
2. f is locally strictly concave at x*, that is, Hf (x*) is negative definite then x* is a strict local maximum of f .
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