We give an alternative derivation of Weldon's formula for combining products of factors with nonidentical analytic behavior. While such a formula would appear to be useful in finite-temperature calculations, we give an example of a zero-temperature calculation, namely, the degenerate electron gas, to justify the result.

• Received 28 September 1992

DOI:https://doi.org/10.1103/PhysRevD.47.601