Fejér-type positive operator based on Takenaka--Malmquist system on unit circle

F. G. Abdullayev, V. V. Savchuk

Let $\phi =\{{\phi }_k{\}}_{k=-\infty }^{\infty }$ denote the extended Takenaka--Malmquist system on unit circle $\mathbb{T}$ and let ${\sigma }_{n,\phi }(f),$ $f\in L^1(\mathbb{T})$, be the Fejér-type operator…