A note on $\Cal J$-ultrafilters and $P$-points

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A note on $\Cal J$-ultrafilters and $P$-points. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 48 (2007), issue 2, pp. 43-48

MSC: 03E05, 03E35, 54H05 | MR 2512901 | Zbl 1163.03027