Second Derivative of Convex Real Function is Non-Negative
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From Real Function is Convex iff Derivative is Increasing, $f$ is convex if and only if $f'$ is increasing.
- Second Derivative of Concave Real Function is Non-Positive
- Second Derivative of Strictly Concave Real Function is Strictly Negative
- 1977: K.G. Binmore: Mathematical Analysis: A Straightforward Approach ... (previous) ... (next): $\S 12.19$
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