http://dspace.nbuv.gov.ua:80/handle/123456789/150396 2026-04-15T01:20:42Z http://dspace.nbuv.gov.ua:80/handle/123456789/155742 An amalgamation property for metric spaces Ivanov, A.; Majcher-Iwanow, B. In this paper we show that sufficiently similar finite metric spaces can be amalgamated so that the distance between them is sufficiently small. 2016-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/155740 Factorization of elements in noncommutative rings, I Facchini, A.; Fassina, M. We extend the classical theory of factorization in noncommutative integral domains to the more general classes of right saturated rings and right cyclically complete rings. Our attention is focused, in particular, on the factorizations of right regular elements into left irreducible elements. We study the connections among such factorizations, right similar elements, cyclically presented modules of Euler characteristic 0 and their series of submodules. Finally, we consider factorizations as a product of idempotents. 2016-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/155739 On nilpotent Chernikov 2-groups with elementary tops Drozd, Y.A.; Plakosh, A.I. We give an explicit description of nilpotent Chernikov 2-groups with elementary top and basis of rank 2. 2016-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/155738 Groups satisfying certain rank conditions Dixon, M.R.; Kurdachenko, L.A.; Pypka, A.A.; Subbotin, I.Ya. This is a survey of a number of recent results concerned with groups whose subgroups satisfy certain rank conditions. 2016-01-01T00:00:00Z