Berge, Claude Sur les ensembles purs et les ultrafiltres. (French) Zbl 0056.15802 C. R. Acad. Sci., Paris 238, 2136-2137 (1954). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Keywords:Topology PDFBibTeX XMLCite \textit{C. Berge}, C. R. Acad. Sci., Paris 238, 2136--2137 (1954; Zbl 0056.15802)