A proof of Pisot's dth root conjecture

Details A proof of Pisot's dth root conjecture A proof of Pisot's dth root conjecture

2000-10-02

arxiv.org/abs/math/0010024v1

Ann. of Math. (2) 151 (2000), no. 1, 375--383

Mathematics

Number Theory

9 pages

Scientific paper

Let $\{b(n):n\in\N\}$ be the sequence of coefficients in the Taylor expansion of a rational function $R(X)\in\Q(X)$ and suppose that b(n) is a perfect $d^{\rm th}$ power for all large n. A conjecture of Pisot states that one can choose a $d^{\rm th}$ root a(n) of b(n) such that $\sum a(n)X^n$ is also a rational function. Actually, this is the fundamental case of an analogous statement formulated for fields more general than $\Q$. A number of papers have been devoted to various special cases. In this note we shall completely settle the general case.

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