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:''This article is about a formulation of quantum mechanics. For integrals along a path, also known as line or contour integrals, see [[Path integral]].''
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The '''path integral formulation''' of [[quantum mechanics]] was developed in 1948 by [[Richard Feynman]]. Some preliminaries were worked out earlier, in the course of his [[doctoral thesis]] work with [[John Archibald Wheeler]]. It is a description of quantum theory which generalizes the [[action (physics)|action principle]] of [[classical mechanics]]. It replaces the classical notion of a single, unique history for a system with a sum, or [[functional integral]], over an infinity of possible histories to compute a quantum [[probability amplitude|amplitude]].
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