The second Hankel determinant of logarithmic coefficients and logarithmic inverse coefficients for the class of bounded turning functions of order α
摘要
In this paper, we obtain sharp bounds for the second Hankel determinant of logarithmic coefficients H2,1(Ff/2) of bounded turning functions of order α. Furthermore, we obtain sharp bounds of the second Hankel determinant of logarithmic inverse coefficients of H2,1(Ff−1/2), where f-1 is the inverse function of f. For the class 𝒫′(α), we conclude that the bounds for H2,1(Ff /2) and H2,1(Ff−1/2) are the same only for 1/4 ≤ α < 1.