On a conjecture for trigonometric sums by S. Koumandos and S. Ruscheweyh

Priyanka Sangal, A. Swaminathan

S. Koumandos and S. Ruscheweyh posed the following conjecture: For $\rho \in (0,1]$ and $0<\mu \le {\mu }^{\ast }(\rho )$, the partial sum $s_n^{\mu }(z)=\sum _{k=0}^n\frac{(\mu {)}_k}{k!}{z}^k$, $…