A Variation on Selberg's Approximation Problem
arXiv:1401.0904 · doi:10.1112/S0025579314000199
Abstract
Let $α\in\mathbb{C}$ in the upper half-plane and let $I$ be an interval. We construct an analogue of Selberg's majorant of the characteristic function of $I$ that vanishes at the point $α$. The construction is based on the solution to an extremal problem with positivity and interpolation constraints.
21 pages. A few typos corrected for version 2