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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 integral is an important concept in mathematics. Integration is one of the two main operations in calculus, with its inverse, differentiation, being the other. Given a function f of a real variable x and an interval [a, b] of the real line, the definite integral. is defined informally as the signed area of the region in the xy-plane that is bounded by the graph of f, the x-axis and the vertical lines x = a and x = b.