Convex function
In mathematics, a convex function is any function with value of the weighted average of 2 points is less than or equal to the weighted average of the function at those points. Also, a function is convex if and only if its epigraph is a convex set.
Convex function on an interval.
A function (in black) is convex if and only if the region above its graph (in green) is a convex set.
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