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Mathematica is described as 'computational software program used widely in scientific, engineering, and mathematical fields and other areas of technical computing' and is a very popular app in the education & reference category. Mathematically, this involves finding stationary values of integrals of the form I=int_b^af(y,y^.,x)dx.

Calculus of variations seeks to find the path, curve, surface, etc., for which a given function has a stationary value (which, in physical problems, is usually a minimum or maximum).

A branch of mathematics that is a sort of generalization of calculus.

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