= Steffensen's inequality
{wiki=Steffensen's_inequality}
Steffensen's inequality is a result in mathematics related to the approximation of integrals and the estimation of the error in numerical integration. It provides bounds on the difference between the integral of a function and its numerical approximation using a specific technique, often involving Riemann sums or similar methods. The inequality can be stated as follows: Let \\( f \\) be a function that is monotonic on the interval \\(\[a, b\]\\).
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