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@@.