Rational approximations to $\sqrt[3]{2}$ and other algebraic numbers revisited

Abstract

In this paper, we establish improved effective irrationality measures for certain numbers of the form $\sqrt[3]{n}$, using approximations obtained from hypergeometric functions. These results are very close to the best possible using this method. We are able to obtain these results by determining very precise arithmetic information about the denominators of the coefficients of these hypergeometric functions. Improved bounds for $\theta (k,l;x)$ and $\psi (k,l;x)$ for $k=1,3,4,6$ are also presented.

arXiv commentpublished version, but with some small changes, including typo in statement of Lemma 5.1(b), leading to simpler proof of Theorem 2.1

References in corpus (1)

• Complete solution of the diophantine equation $X^2+1=d{Y}^4$ and a related family of quartic Thue equations

Cited by in corpus (3)

• Padé approximation for a class of hypergeometric functions and parametric geometry of numbers
• Thue's Fundamentaltheorem, II: Further Refinements and Examples
• Improved Constants for Effective Irrationality Measures from Hypergeometric Functions