The concepts of causality, linearity, time symmetry, unitarity, and crossing symmetry and their relation to dispersion relations are discussed. Dispersion relations are applied to some simple electrical circuits in order to illustrate some of their properties and then a simple example is given of the use of dispersion relations for the analysis of the forward angle scattering of pions on protons.
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Holbrow et al. (1964) studied this question.
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