An arithmetical examples of a non-Borel Luzin analytic set
Matematičeskie zametki, Tome 22 (1977) no. 4, pp. 525-534
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N. N. Luzin has constructed a sieve defining a screened non-Borel analytic set and has indicated the arithmetical properties of points of this set. In this article it is shown that a screened analytic set contains continuum number of points which do not have these arithmetical properties. Necessary and sufficient arithmetical conditions on points are found, under which they lie in a Luzin set screened by a sieve.