Geodesic
Union of $U_r$-sets for the system of characters of the group of $p$-adic numbers
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 4 (2019), pp. 42-46 Cet article a éte moissonné depuis la source Math-Net.Ru

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The following theorem is proved: the union of countable many closed $U_{r}$-sets ($r>2$) for the Vilenkin–Dzhafarli system is again a $U_{r}$-set for this system. 
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T. D. Kozlovskaya. Union of $U_r$-sets for the system of characters of the group of $p$-adic numbers. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 4 (2019), pp. 42-46. http://geodesic.mathdoc.fr/item/VMUMM_2019_4_a5/

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