@MISC{Zynel_topologicalspaces, author = {Mariusz Zynel and Adam Guzowski}, title = {Topological Spaces}, year = {} }
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Abstract
this paper. The following propositions are true: (1) Let A, B be non empty sets and R 1 , R 2 be relations between A and B. Suppose that for every element x of A and for every element y of B holds hhx; yii 2 R 1 iff hhx;