Geodesic
Some Estimates for Holomorphic Functions at the Boundary of the Unit Disc
Kragujevac Journal of Mathematics, Tome 44 (2020) no. 3, p. 475

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In this paper, for holomorphic function $f(z)=z+c_{2}z^{2}+c_{3}z^{3}+\cdots$ belong to the class of $\mathcal{N}(\lambda)$, it has been estimated from below the modulus of the angular derivative of the function $\frac{zf'(z)}{f(z)}$ on the boundary point of the unit disc.
Classification : 30C80 32A10
Keywords: Schwarz lemma, holomorphic function, angular limit 
B. N. Ornek. Some Estimates for Holomorphic Functions at the Boundary of the Unit Disc. Kragujevac Journal of Mathematics, Tome 44 (2020) no. 3, p. 475 . http://geodesic.mathdoc.fr/item/KJM_2020_44_3_a11/
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     title = {Some {Estimates} for {Holomorphic} {Functions} at the {Boundary} of the {Unit} {Disc}},
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     url = {http://geodesic.mathdoc.fr/item/KJM_2020_44_3_a11/}
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