Best Approximation-Preserving Operators over Hardy Space

Fahreddin. G. Abdullayev, Viktor V. Savchuk, Maryna V. Savchuk

Let $T_n$ be the linear Hadamard convolution operator acting over Hardy space $H^q$, $1\le q\le \infty$. We call $T_n$ a best approximation-preserving operator (BAP operator) if $T_…