Hostname: page-component-586b7cd67f-l7hp2 Total loading time: 0 Render date: 2024-11-22T09:20:08.438Z Has data issue: false hasContentIssue false

Entire Solutions Of The Functional Equation f(f(z)) = g(z)

Published online by Cambridge University Press:  20 November 2018

W. J. Thron*
Affiliation:
University of Colorado
Rights & Permissions [Opens in a new window]

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

In this note it is proved that: the functional equation

(1) f(f(z)) = g(z),

where g{z) is an entire function of finite order, which is not a polynomial, and which takes on a certain value p only a finite number of times, does not have a solution f(z) which is an entire function.

Type
Research Article
Copyright
Copyright © Canadian Mathematical Society 1956

References

1. Hadamard, J., Two works on iteration and related questions, Bull. Amer. Math. Soc, 50 (1944), 6775.Google Scholar
2. Isaacs, R., Iterates of fractional order, Can. J. Math., 2 (1950), 409416.Google Scholar
3. Kneser, H., Reelle analytische Lösungen der Gleichung und verwandter Funktionalgleichungen, J. reine angew. Math., 187 (1950), 5667.Google Scholar
4. Pólya, G., On an integral function of an integral function, J. London Math. Soc, 1 (1926), 1215.Google Scholar
5. Titchmarsh, E. C., The Theory of Functions (2nd ed., Oxford, 1939).Google Scholar