High Quality Content by WIKIPEDIA articles! In numerical analysis, Steffensen's method is a root-finding method. It is similar to Newton's method and it also achieves quadratic convergence, but it does not use derivatives. The method is named after Johan Frederik Steffensen.Numerical analysis is the study of algorithms that use numerical values (as opposed to general symbolic manipulations) for the problems of continuous mathematics (as distinguished from discrete mathematics). One of the earliest mathematical writings is the Babylonian tablet YBC 7289, which gives a sexagesimal numerical approximation of sqrt{2}, the length of the diagonal in a unit square. Being able to compute the sides of a triangle (and hence, being able to compute square roots) is extremely important, for instance, in carpentry and construction.

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