4. New notions of separation
Classical separations are insufficient from a theoretical point of view, but are also insufficient for certain applications, notably in computer science (p. 465 of ) or in applied geometry; hence the introduction of new separation notions weaker than the T 2 separation.
4.1 Separation R0 (Shanin)
Definition (Shanin separation (1943)). A topological space
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New notions of separation
Application spaces between topological spaces
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