Abstract
It is pointed out that the Poisson equation governing the four-position x in a continuous medium, which is a generalization of the Feynman graph, corresponds to one of the Landau equations for the graph: The solution of the equation with a given boundary condition is inserted into the action integrand of the Feynman integral to give Koba and Nielsen's ker nels in the generalized Veneziano representation. It is also shown that we can get the same results if we work consistently with the four-positions x* of a dual of the original Feynman graph, the four-position x* also satisfying the Laplace equation inside the medium. If x is regarded as a potential, the function x* is as a stream function.
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