TY - JOUR AU - V. V. Savchuk AU - M. V. Savchuk AU - S. O. Chaichenko PY - 2019/04/25 Y2 - 2024/03/28 TI - Approximation of bounded holomorphic and harmonic functions by Fejér means JF - Ukrains’kyi Matematychnyi Zhurnal JA - Ukr. Mat. Zhurn. VL - 71 IS - 4 SE - Research articles DO - UR - https://umj.imath.kiev.ua/index.php/umj/article/view/1455 AB - We compute the exact values of the exact upper bounds on the classes of bounded holomorphic and harmonic functionsin a unit disk for the remainders in a Voronovskaya-type formula in the case of approximation by Fej´er means. We alsopresent some consequences that are of independent interest. ER -