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单词 Convex Function
释义

Convex Function

A function whose value at the Midpoint of every Interval in its Domain does not exceed theAverage of its values at the ends of the Interval. In other words, a function is convex on anInterval if for any two points and in ,


If has a second Derivative in , then a Necessary and Sufficient conditionfor it to be convex on that Interval is that the second Derivative for all in .

See also Concave Function, Logarithmically Convex Function


References

Eggleton, R. B. and Guy, R. K. ``Catalan Strikes Again! How Likely is a Function to be Convex?'' Math. Mag. 61, 211-219, 1988.

Gradshteyn, I. S. and Ryzhik, I. M. Tables of Integrals, Series, and Products, 5th ed. San Diego, CA: Academic Press, p. 1100, 1980.


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