Geodesic
Third Hankel determinant for the inverse of reciprocal of bounded turning functions has a positive real part of order alpha
Ufa mathematical journal, Tome 9 (2017) no. 2, pp. 109-118 Cet article a éte moissonné depuis la source Math-Net.Ru

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Let $RT$ be the class of functions $f(z)$ univalent in the unit disk $E = {z : |z| 1}$ such that $\mathrm{Re}\, f'(z) > 0$, $z\in E$, and $H_3(1)$ be the third Hankel determinant for inverse function to $f(z)$. In this paper we obtain, first an upper bound for the second Hankel determinant, $|t_2 t_3 - t_4|$, and the best possible upper bound for the third Hankel determinant $H3(1)$ for the functions in the class of inverse of reciprocal of bounded turning functions having a positive real part of order alpha.
Keywords: univalent function, function whose reciprocal derivative has a positive real part, third Hankel determinant, positive real function, Toeplitz determinants. 
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B. Venkateswarlu; N. Rani. Third Hankel determinant for the inverse of reciprocal of bounded turning functions has a positive real part of order alpha. Ufa mathematical journal, Tome 9 (2017) no. 2, pp. 109-118. http://geodesic.mathdoc.fr/item/UFA_2017_9_2_a8/

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