Geodesic
On the topological strength of set-theoretic operations
Sbornik. Mathematics, Tome 63 (1989) no. 2, pp. 393-404

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This paper is devoted to the classical subject of set-theoretic operations. A new concept, the topological strength of set-theoretic operations, is introduced and studied. Bibliography: 15 titles. 
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     author = {I. I. Parovichenko},
     title = {On the topological strength of set-theoretic operations},
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I. I. Parovichenko. On the topological strength of set-theoretic operations. Sbornik. Mathematics, Tome 63 (1989) no. 2, pp. 393-404. http://geodesic.mathdoc.fr/item/SM_1989_63_2_a8/