Rational approximations to algebraic Laurent series with coefficients in a finite field

Details Rational approximations to algebraic Laurent series with coefficients in a finite field Rational approximations to algebraic Laurent series with coefficients in a finite field

2011-02-28

arxiv.org/abs/1102.5764v1

Mathematics

Number Theory

Scientific paper

In this paper we give a general upper bound for the irrationality exponent of algebraic Laurent series with coefficients in a finite field. Our proof is based on a method introduced in a different framework by Adamczewski and Cassaigne. It makes use of automata theory and, in our context, of a classical theorem due to Christol. We then introduce a new approach which allows us to strongly improve this general bound in many cases. As an illustration, we give few examples of algebraic Laurent series for which we are able to compute the exact value of the irrationality exponent.

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