Let d be a positive integer and α a real algebraic number of degree d + 1. Set $α̲:= (α,α²,...,α^{d})$. It is well-known that $c(α̲) := lim inf_{q→ ∞} q^{1/d}·||qα̲|| > 0$, where ||·|| denotes the distance to the nearest integer. Furthermore, $c(α̲)n^{-1/d} ≤ c(nα̲) ≤ nc(α̲)$ for any integer n ≥ 1. Our main result asserts that there exists a real number C, depending only on α, such that $c(nα̲) ≤ Cn^{-1/d}$ for any integer n ≥ 1.
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