The Newman–Shapiro problem

  • Yurii Belov

    St. Petersburg State University, Russia
  • Alexander Borichev

    Aix Marseille Université, France
The Newman–Shapiro problem cover
Download PDF

This article is published open access under our Subscribe to Open model.


We give a negative answer to the Newman–Shapiro problem on weighted approximation for entire functions formulated in 1966 and motivated by the theory of operators on the Fock space. There exists a function in the Fock space such that its exponential multiples do not approximate some entire multiples in the space. Furthermore, we establish several positive results under different restrictions on the function in question.

Cite this article

Yurii Belov, Alexander Borichev, The Newman–Shapiro problem. J. Eur. Math. Soc. 25 (2023), no. 4, pp. 1227–1251

DOI 10.4171/JEMS/1209