Abstract Let A denote the class of normalised analytic functions f in the open unit disk D: =\z {C: |z|<1\} with f (0) =0 and f' (0) =1. A function f A is said to be convex if f (D) is convex. We establish a sharp upper bound for the third Hankel determinant corresponding to the inverse coefficients of convex univalent (that is, one-to-one) functions in the unit disk D.
ALLU et al. (Tue,) studied this question.