Abstract:
The relationship is established between the approximation in $L^2[-\pi,\pi]$ by exponentials with the set of frequencies of Beurling–Malliavin density less than $1$ and meromorphic interpolation on $\mathbb Z$. Furthermore, it is shown that typical $L^2[-\pi,\pi]$ functions admit such an approximation.
Keywords:Paley–Wiener space, exponential systems, approximation theory, interpolation by meromorphic functions.