[Pi](z) = [beta]^(-1) e^([beta] z), [psi](z) = [beta]^(-3)([beta]z + 1) e^(-[beta] z), (39)
Encyclopaedia Britannica, 11th Edition, "Capefigue" to "Carneades" Volume 5, Slice 3 · 第 20 / 74 题