The exponential function possesses the properties
(i.) exp (x + y) = exp x × exp y.
d
(ii.) --- exp x = exp x.
dx
(iii.) exp x = 1 +x + x²/2! + x³/3! + ...
Encyclopaedia Britannica, 11th Edition, "Logarithm" to "Lord Advocate" Volume 16, Slice 8 · 第 8 / 67 题