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Path Integrals. PathintegralswereinventedbyFeynman(whileagraduatestudent!) asanalternative. formulation of quantum mechanics. Our goal in this chapter is to show that quantum. mechanics and quantum ï¬eld theory can be completely reformulated in terms of. path integrals. The path integral formulation is particularly useful for quantum ï¬eld.
The work per unit charge done by the electric field along an infinitesmal path length ds is given by the scalar product Then the work done against the field per unit charge in moving from A to B is given by the line integral: