Lebedev–Milin inequality
In mathematics, the Lebedev–Milin inequality is any of several inequalities for the coefficients of the exponential of a power series, found by and . It was used in the proof of the Bieberbach conjecture, as it shows that the Milin conjecture implies the Robertson conjecture. They state that if for complex numbers β and α, and "n" is a positive integer, then See also exponential formula (on exponentiation of power series).