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1. CMB 2011 (vol 56 pp. 283)

Coons, Michael
 Transcendental Solutions of a Class of Minimal Functional Equations We prove a result concerning power series $f(z)\in\mathbb{C}[\mkern-3mu[z]\mkern-3mu]$ satisfying a functional equation of the form $$f(z^d)=\sum_{k=1}^n \frac{A_k(z)}{B_k(z)}f(z)^k,$$ where $A_k(z),B_k(z)\in \mathbb{C}[z]$. In particular, we show that if $f(z)$ satisfies a minimal functional equation of the above form with $n\geqslant 2$, then $f(z)$ is necessarily transcendental. Towards a more complete classification, the case $n=1$ is also considered. Keywords:transcendence, generating functions, Mahler-type functional equationCategories:11B37, 11B83, , 11J91
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