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Cubic Diophantine inequalities
Published online by Cambridge University Press: 26 February 2010
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Let λ1, …, λ8 be any non-zero real numbers not all of the same sign and not all in rational ratios. According to a theorem of Davenport and Roth [3], given a real number κ, the inequality
has infinitely many solutions in positive integers for any ε > 0. Recently Liu, Ng and Tsang [5] gave a refinement of this result: for any δ > 0, the inequality
has infinitely many solutions in positive integers. In the present note we obtain a better exponent.
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