Geodesic
On the set of joint representatives of two congruence classes
Informatics and Automation, Modern problems of mathematics, mechanics, and mathematical physics, Tome 290 (2015), pp. 202-210.

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We estimate how many numbers in a given interval have the property that their residues modulo two different fixed numbers belong to two given sets. The estimates obtained are order sharp. 
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Yu. N. Shteinikov. On the set of joint representatives of two congruence classes. Informatics and Automation, Modern problems of mathematics, mechanics, and mathematical physics, Tome 290 (2015), pp. 202-210. http://geodesic.mathdoc.fr/item/TRSPY_2015_290_a16/

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