Abstract
1. A familiar device in the study of statistical distributions is to form the moment-generating function where the bar denotes averaging over all values of the statistical variate x. The moments μr of x are the coefficients of αr/r!, and the derived coefficients in the expansion of K ≡ log M are termed the semi-invariants kr. In particular, and, for the normal (Gaussian) law, we have the simple formula

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