K-J. Wirths

collaborators

3 papers

math.CV2010

On some problems of James Miller

B. Bhowmik, S. Ponnusamy, K-J. Wirths

We consider the class of meromorphic univalent functions having a simple pole at $p \in (0, 1)$ and that map the unit disc onto the exterior of a domain which is starlike with respect…

math.CV2010

Characterization and the pre-Schwarzian norm estimate for concave univalent functions

B. Bhowmik, S. Ponnusamy, K-J. Wirths

Let $C o (α)$ denote the class of concave univalent functions in the unit disk $\ID$. Each function $f \in C o (α)$ maps the unit disk $\ID$ onto the complement of an unbounded convex s…

math.CV2010

Domains of variability of Laurent coefficients and the convex hull for the family of concave univalent functions

B. Bhowmik, S. Ponnusamy, K-J. Wirths

Let $\ID$ denote the open unit disc and let $p \in (0, 1)$ . We consider the family $C o (p)$ of functions $f:\ID\to \overline{\IC}$ that satisfy the following conditions: \bee \item[(i…