A function that is never below its linear interpolation. Mathematically, a function f(x) is concave over a convex set S, if for any two points, x1 and x2 in S and for any 0 ≤ \( \alpha \,\,\, \)≤ 1, f[\( \alpha \)x1 + (1 − \( \alpha \))x2] ≥ \( \alpha \)f (x1) + (1 − \( \alpha \)) f (x2).
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(2013). Concave Function. In: Gass, S.I., Fu, M.C. (eds) Encyclopedia of Operations Research and Management Science. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-1153-7_200061
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DOI: https://doi.org/10.1007/978-1-4419-1153-7_200061
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