I. On the concept of boundary: II. The definition of a boundary by means of continuous mappings. III. On the equivalence of certain methods of a boundary. (Matematĭceskiĭ sbornik n. s. 25(67), 387-414 (1949); 26(68), 225-227 (1950); 26(68), 228-236 (1950))

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American Mathematical Society, 1951 - Mathematics - 52 pages
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