Representation of squares by monic second degree polynomials in the field of $p$-adic meromorphic functions

Details Representation of squares by monic second degree polynomials in the field of $p$-adic meromorphic functions Representation of squares by monic second degree polynomials in the field of $p$-adic meromorphic functions

2010-03-09

arxiv.org/abs/1003.1969v1

Mathematics

Complex Variables

21 pages

Scientific paper

We prove a result on the representation of squares by second degree polynomials in the field of $p$-adic meromorphic functions in order to solve positively B\"uchi's $n$ squares problem in this field (that is, the problem of the existence of a constant $M$ such that any sequence $(x_n^2)$ of $M$ - not all constant - squares whose second difference is the constant sequence $(2)$ satisfies $x_n^2=(x+n)^2$ for some $x$). We prove (based on works by Vojta) an analogous result for function fields of characteristic zero, and under a Conjecture by Bombieri, an analogous result for number fields. Using an argument by B\"uchi, we show how the obtained results improve some theorems about undecidability for the field of $p$-adic meromorphic functions and the ring of $p$-adic entire functions.

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