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On simultaneous rational approximation to a real number and its integral powers

Yann Bugeaud (2010)

Annales de l’institut Fourier

For a positive integer n and a real number ξ , let λ n ( ξ ) denote the supremum of the real numbers λ such that there are arbitrarily large positive integers q such that | | q ξ | | , | | q ξ 2 | | , ... , | | q ξ n | | are all less than q - λ . Here, | | · | | denotes the distance to the nearest integer. We study the set of values taken by the function λ n and, more generally, we are concerned with the joint spectrum of ( λ 1 , ... , λ n , ... ) . We further address several open problems.

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