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math.GN2020★ 1 cited
On two types of ultrafilter extensions of binary relations
Denis I. Saveliev
There exist two distinct types of ultrafilter extensions of binary relations, one discovered in universal algebra and modal logic, and another, in model theory and algebra of ultra…
math.GN2020
On reduction and separation of projective sets in Tychonoff spaces
Denis I. Saveliev
We show that for every Tychonoff space and Hausdorff operation , the class generated from zero sets in by has the reduction or…