Abstract

i. W. Gurewicz, "Relativ perfecte Teile von Punktmengen und Mengen (A)," Fundam. Math., 12, 78-109 (1928). 2. V.G. Kanovei and A. V. Ostrovskii, "On non-Borel FI~-sets," Dokl. Akad, Nauk SSSR, 260, No. 5, 1061-1064 (1981). 3. Textbook on Mathematical Logic, Part II, Set Theory [in Russian], Nauka, Moscow (1982). 4. N.N. Luzin, Lectures on Analytic Sets and Their Applications [in Russian], GITTL, Moscow (1953). 5. J. Shenfield, Mathematical Logic [Russian translation], Nauka, Moscow (1975). 6. T. Joch, Set Theory and the Forcing Method [Russian translation], Mir, Moscow (1973).

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