English

An interpolation problem in the Denjoy-Carleman classes

Analysis of PDEs 2022-01-19 v2 Functional Analysis

Abstract

Inspired by some iterative algorithms useful for proving the real analyticity (or the Gevrey regularity) of a solution of a linear partial differential equation with real-analytic coefficients, we consider the following question. Given a smooth function defined on [a,b]R[a,b]\subset\mathbb{R} and given an increasing divergent sequence dnd_n of positive integers such that the derivative of order dnd_n of ff has a growth of the type MdnM_{d_n}, when can we deduce that ff is a function in the Denjoy-Carleman class CM([a,b])C^M([a,b])? We provide a positive result, and we show that a suitable condition on the gaps between the terms of the sequence dnd_n is needed.

Cite

@article{arxiv.2112.03180,
  title  = {An interpolation problem in the Denjoy-Carleman classes},
  author = {Paolo Albano and Marco Mughetti},
  journal= {arXiv preprint arXiv:2112.03180},
  year   = {2022}
}
R2 v1 2026-06-24T08:06:17.533Z