Hintikka, Jaakko; Sandu, Gabriel A revolution in logic? (English) Zbl 0891.03001 Nord. J. Philos. Log. 1, No. 2, 169-183 (1996). Reviewer: L.Löfgren (Lund) MSC: 03A05 03-03 01A55 PDF BibTeX XML Cite \textit{J. Hintikka} and \textit{G. Sandu}, Nord. J. Philos. Log. 1, No. 2, 169--183 (1996; Zbl 0891.03001) Full Text: Link
Kleinberg, E. M. A combinatorial characterization of normal M-ultrafilters. (English) Zbl 0402.03049 Adv. Math. 30, 77-84 (1978). MSC: 03E55 03E05 03C20 54A25 PDF BibTeX XML Cite \textit{E. M. Kleinberg}, Adv. Math. 30, 77--84 (1978; Zbl 0402.03049) Full Text: DOI