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Path integral may refer to: 1  Line integral, the integral of a function along a curve. 2  Functional integration, the integral of a functional over a space of curves. 3  Path integral formulation of quantum mechanics using functional integration, due to Richard Feynman.
Well, the method of applying the path integral formulation can be explained in simple terms. Let's step back and see why we use it, and how it comes in play. Warning: long post below. Grab a cup of coffee or a banana.