Abstract
The aim of the present note is to give path integral formulas for the solution of the Cauchy problem of the Dirac equation and the relativistic propagator in two space-time dimensions. They have a close analogy with the Feynman-Kac formula for the heat equation, but the countably additive path space measures constructed are other than the Weiner measure. The same method applies to a certain hyperbolic system of the first order.
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