Originally published in 1779, Euler's De Serie Lambertina provides one of the early examples of the Lambert W function, a special function used in the solution to certain transcendental equations. Following the work of Johann Heinrich Lambert in 1759, who discussed a series solution to the general polynomial in series, and then particularly the solution of the general trinomial, Euler describes a symmetric form of the trinomial and its series solution. Euler investigates the series' special cases and general properties, and its use in solving certain transcendental equations. He provides several proofs of the validity of the series expansion to solve the trinomial, and in doing so he reveals several notable series expansions of functions such as the natural logarithm and the factorial.
"Euler's De Serie Lambertina, Translated from Latin to English With Supplementary Notes,"
Euleriana: 1(2), pp.252-272.
Available at: https://scholarlycommons.pacific.edu/euleriana/vol1/iss2/10