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On the theory of infinite systems of differential equations and their application to the theory of stochastic processes and the perturbation theory of quantum mechanics
Arley (I943) ~ 2.2--2.6 and chap.7. We shall in the following tacitly assume x to be real, but the proofs are also valid in ease x varies on a regular curve L without double points in the complex plane, if, only, we interpret I x--xo[ as the length of the …