On Iteration of Bijective Functions with Discontinuities Publications, to be read Some remarks on the stability of the Cauchy equation and completeness Families of Commuting Formal Power Series and Formal Functional Equations

Families of Commuting Formal Power Series and Formal Functional Equations

Jointly written with LUDWIG REICH.

Annales Mathematicae Silesianae 35 Issue 1, 55-76 (2020). DOI 10.2478/amsil-2020-0020

Abstract. In this paper we describe families of commuting invertible formal power series in one indeterminate over ℂ, using the method of formal functional equations. We give a characterization of such families where the set of multipliers (first coefficients) σ of its members F(x)=σx+… is infinite, in particular of such families which are maximal with respect to inclusion, so called families of type I. The description of these families is based on Aczél-Jabotinsky differential equations, iteration groups, and on some results on normal forms of invertible series with respect to conjugation.


harald.fripertinger "at" uni-graz.at, October 3, 2024

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