## Some points in $$\beta N$$.(English)Zbl 0345.02047

### MSC:

 3e+35 Consistency and independence results 3e+15 Descriptive set theory
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### References:

 [1] Fichtenholz, Studia Math. 5 pp 69– (1934) [2] Efimov, Trudy Moskov. Mat. Ob?i. 23 pp 243– (1970) [3] Comfort, The Theory of Ultrafilters (1974) · Zbl 0298.02004 [4] DOI: 10.1016/0003-4843(70)90005-7 · Zbl 0231.02067 [5] DOI: 10.1215/S0012-7094-56-02337-7 · Zbl 0073.39602 [6] Halmos, Measure theory (1950) [7] DOI: 10.1016/0003-4843(70)90009-4 · Zbl 0222.02075 [8] DOI: 10.2307/1996350 · Zbl 0263.02033 [9] Jech, Lectures in set theory (1971) [10] Halmos, Lectures on Boolean algebras (1963) [11] Halmos, Na?ve set theory (1960) [12] DOI: 10.2307/1995690 · Zbl 0212.54901
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