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 2018Show all

3 papers · 1 filter

math.CV2018★ 1 cited

Logarithmic coefficients of the inverse of univalent functions

S. Ponnusamy, N. L. Sharma, K. -J. Wirths

Let $\es$ be the class of analytic and univalent functions in the unit disk $∣ z ∣ < 1$ , that have a series of the form $f (z) = z + \sum_{n = 2}^{\infty} a_{n} z^{n}$ . Let $F$ be the inverse of t…

math.CV2018★ 1 cited

Logarithmic coefficients problems in families related to starlike and convex functions

S. Ponnusamy, N. L. Sharma, K. -J. Wirths

Let $\es$ be the family of analytic and univalent functions $f$ in the unit disk $\D$ with the normalization $f (0) = f^{'} (0) - 1 = 0$ , and let $γ_{n} (f) = γ_{n}$ denote the logarithmic coefficie…

math.CO2018★ 1 cited

Sarrus rules and dihedral groups

Dirk A. Lorenz, Karl-Joachim Wirths

This paper is devoted to the analysis of a false generalization of the rule of Sarrus and its properties that can be derived with the help of dihedral groups. Further, we discuss a…