Univalent harmonic mappings with integer or half-integer coefficients

S. Ponnusamy, J. Qiao

Let $\mathcal{S}$ denote the set of all univalent analytic functions $f(z)=z+{\sum }_{n=2}^{\infty }{a}_n{z}^n$ on the unit disk $|z|<1$. In 1946 B. Friedman found that the set $\mathcal…