K. Wirths

activity

20102022

most citedOn the Fekete-Szegö problem for concave univalent functions

9 citations · 20 across the 19 of their papers we have counts for

collaborators

Showing 2015Show all

2 papers · 1 filter

math.CV2015★ 2 cited

Where is $f (z) / f^{'} (z)$ univalent?

Milutin Obradović, Saminathan Ponnusamy, Karl-Joachim Wirths

Let $S$ denote the family of all univalent functions $f$ in the unit disk $\ID$ with the normalization $f (0) = 0 = f^{'} (0) - 1$ . There is an intimate relationship between the o…

math.CV2015

Geometric studies on the class $U (λ)$

Milutin Obradović, Saminathan Ponnusamy, Karl-Joachim Wirths

The article deals with the family $U (λ)$ of all functions $f$ normalized and analytic in the unit disk such that $(z / f (z))^{2} f^{'} (z) - 1 < λ$ for some $…

Where is f(z)/f′(z) univalent?

Geometric studies on the class U(λ)

Where is $f (z) / f^{'} (z)$ univalent?

Geometric studies on the class $U (λ)$