New characterizations of T0-spaces

Autores: Josep Guia i Marín , Rafael Lledó, Isabel Segura
Localización: Collectanea mathematica, ISSN 0010-0757, Vol. 37, Fasc. 3, 1986, págs. 255-259
Idioma: inglés
Títulos paralelos:
- Nuevas caracterizaciones de T0-espacios
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Resumen
- Making use of the essential derived operator, we present some new characterizations of $T_0$-spaces in the same way that the already known for $T_D$ and $ET_D$-spaces. It is also proved that an analogous treatment for $T_1, ET_1=R_0,T_{UD}$ and $ET_{UD}$ spaces is not valid.