Geodesic
The ideal $(a)$ is not $G_\delta$ generated
Marta Frankowska1 ; Andrzej Nowik1
1 Department of Mathematics Gdańsk University Wita Stwosza 57 80-952 Gdańsk, Poland
Colloquium Mathematicum, Tome 125 (2011) no. 1, pp. 7-14.

Voir la notice de l'article provenant de la source Institute of Mathematics Polish Academy of Sciences

We prove that the ideal $(a)$ defined by the density topology is not $G_\delta$ generated. This answers a question of Z. Grande and E. Strońska.
DOI : 10.4064/cm125-1-2
Keywords: prove ideal defined density topology delta generated answers question grande stro ska

Marta Frankowska 1 ; Andrzej Nowik 1

1 Department of Mathematics Gdańsk University Wita Stwosza 57 80-952 Gdańsk, Poland 
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Marta Frankowska; Andrzej Nowik. The ideal $(a)$ is not $G_\delta$ generated. Colloquium Mathematicum, Tome 125 (2011) no. 1, pp. 7-14. doi : 10.4064/cm125-1-2. http://geodesic.mathdoc.fr/articles/10.4064/cm125-1-2/

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