Espacios de derivados.
Espais essencialment T, T, T, T i T.
In this paper, by means of the essential derived operator, the classes of topological spaces whose T0 identification spaces are TDD, TF, TY or TL are characterized. This classes are related with the classes of essentially-T1-spaces (R0 spaces), essentially-TD-spaces and essentially-TUD-spaces, already known. ...
New characterizations of T-spaces.
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