## Sums of ultrafilters.(English)Zbl 0166.18602

topology
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### References:

 [1] E. Čech, Topological spaces, Publ. H. of ČSAV, Praha, 1965. [2] Zdeněk Frolík, The topological product of countably compact spaces, Czechoslovak Math. J. 10 (85) (1960), 329 – 338 (English, with Russian summary). · Zbl 0099.38502 [3] Zdeněk Frolík, On two problems of W. W. Comfort, Comment. Math. Univ. Carolinae 8 (1967), 139 – 144. · Zbl 0162.26502 [4] J. Novák, On the Cartesian product of two compact spaces, Fund. Math. 40 (1953), 106 – 112. · Zbl 0053.12404 [5] Walter Rudin, Homogeneity problems in the theory of Čech compactifications, Duke Math. J. 23 (1956), 409 – 419. · Zbl 0073.39602 [6] Hidetaka Terasaka, On Cartesian product of compact spaces, Osaka Math. J. 4 (1952), 11 – 15. · Zbl 0047.41801
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