A “zero-one” law for diophantine approximations
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Tài liệu tham khảo
V. G. Sprindzhuk,The Metric Theory of Diophantine Approximations [in Russian], Nauka, Moscow (1977).
G. Harman, Metric diophantine approximation with two restricted variables I: Two square-free integers, or integers in arithmetic progressions,Math. Proc. Cambr. Phil. Soc.,103, 197–206 (1988).