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A inflection or inflection point is an point in the domain of a twice-differentiable function at which the second derivative of the function is zero. That is, if f can be differentiated twice and a is a point in the domain for which f (a) 0 , then a is an inflection point. Inflection points are not necessarily @@stationary points@@. f(x) inflection point x See also: @@maximum@@, @@minimum@@.