An introduction to extended Gevrey regularity

TL;DR

This paper provides an overview of extended Gevrey regularity, a framework for analyzing smooth functions with weaker regularity than traditional Gevrey classes, including dual spaces, microlocal analysis, and applications.

Contribution

It offers a comprehensive survey of extended Gevrey classes, clarifies their key features, and discusses related dual spaces, microlocal analysis, and potential applications.

Findings

Extended Gevrey classes encompass functions with weaker regularity than Gevrey functions.

The paper reviews dual spaces of ultradistributions in the context of extended Gevrey regularity.

Applications suggest new directions for research in regularity theory and microlocal analysis.

Abstract

Gevrey classes are the most common choice when considering the regularities of smooth functions that are not analytic. However, in various situations, it is important to consider smoothness properties that go beyond Gevrey regularity, for example when initial value problems are ill-posed in Gevrey settings. Extended Gevrey classes provide a convenient framework for studying smooth functions that possess weaker regularity than any Gevrey function. Since the available literature on this topic is scattered, our aim is to provide an overview to extended Gevrey regularity, highlighting its most important features. Additionally, we consider related dual spaces of ultradistributions and review some results on micro-local analysis in the context of extended Gevrey regularity. We conclude the paper with a few selected applications that may motivate further study of the topic.