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\(k\)-regular power series and Mahler-type functional equations. (English) Zbl 0821.11013
The author shows that a \(k\)-regular power series satisfies a Mahler-type functional equation (the notion of \(k\)-regular power series has been introduced by Allouche and Shallit generalizing the concept of \(k\)- automatic power series).
The author shows that the converse of this result is not true unless we add an extra hypothesis on the Mahler-type functional equation. Furthermore, from this property transcendence results at algebraic points can be deduced for \(k\)-regular power series with coefficients in the algebraic closure of \(\mathbb{Q}\) and also a generalization of a result of L. I. Wade (1944) (also shown by Allouche in 1990) concerning power series with coefficients in a finite field.
Reviewer: V.BerthĂ©

MSC:
11B85 Automata sequences
11J81 Transcendence (general theory)
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