Publication details

Almost analytic extensions of ultradifferentiable functions with applications to microlocal analysis


FÜRDÖS Stefan NENNING David Nicolas RAINER Armin SCHINDL Gerhard

Year of publication 2020
Type Article in Periodical
Magazine / Source Journal of Mathematical Analysis and Applications
MU Faculty or unit

Faculty of Science

Keywords Almost analytic extensions; Ultradifferentiable classes; Ultradifferentiable wave front set; Boundary values; Elliptic regularity; Uniqueness of distributions
Description We review and extend the description of ultradifferentiable functions by their almost analytic extensions, i.e., extensions to the complex domain with specific vanishing rate of the (partial derivative) over bar -derivative near the real domain. We work in a general uniform framework which comprises the main classical ultradifferentiable classes but also allows to treat unions and intersections of such. The second part of the paper is devoted to applications in microlocal analysis. The ultradifferentiable wave front set is defined in this general setting and characterized in terms of almost analytic extensions and of the FBI transform. This allows to extend its definition to ultradifferentiable manifolds. We also discuss ultradifferentiable versions of the elliptic regularity theorem and obtain a general quasianalytic Holmgren uniqueness theorem. (C) 2019 Elsevier Inc. All rights reserved.
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