Geodesic
Almost-P-Spaces
Canadian journal of mathematics, Tome 29 (1977) no. 2, pp. 284-288

Voir la notice de l'article provenant de la source Cambridge University Press

A P-space is a topological space in which every Gδ-set is open. P-spaces are fairly rare. For example, the only compact (or even pseudocompact) P-spaces are finite. A larger class of spaces, the almost-P-spaces, consists of those spaces in which G δ-sets have dense interiors. The almost-P-spaces are far less restricted than the P-spaces—for example, there are infinite, compact, connected almost-P-spaces. In this paper, we study almost-P-spaces and raise a number of questions relating to them. 
Levy, Ronnie. Almost-P-Spaces. Canadian journal of mathematics, Tome 29 (1977) no. 2, pp. 284-288. doi: 10.4153/CJM-1977-030-7
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