Loeb, Peter A. (ed.); Wolff, Manfred P. H. (ed.) Nonstandard analysis for the working mathematician. 2nd edition. (English) Zbl 1357.03003 Dordrecht: Springer (ISBN 978-94-017-7326-3/hbk; 978-94-017-7327-0/ebook). xv, 481 p. (2015). Reviewer: M. Yasuhara (Princeton) MSC: 03-02 03-06 03H05 03H10 03H15 28E05 26E35 46S20 47S20 54J05 60H99 91B99 00B15 PDFBibTeX XMLCite \textit{P. A. Loeb} (ed.) and \textit{M. P. H. Wolff} (ed.), Nonstandard analysis for the working mathematician. 2nd edition. Dordrecht: Springer (2015; Zbl 1357.03003) Full Text: DOI
Freudenthal, Hans Über die Enden diskreter Räume und Gruppen. (German) Zbl 0060.40007 Comment. Math. Helv. 17, 1-38 (1945). Reviewer: S. Stoilow MSC: 54-XX PDFBibTeX XMLCite \textit{H. Freudenthal}, Comment. Math. Helv. 17, 1--38 (1945; Zbl 0060.40007) Full Text: DOI EuDML
Freudenthal, Hans Neuaufbau der Endentheorie. (German) Zbl 0060.40006 Ann. Math. (2) 43, 261-279 (1942). Reviewer: S. Stoilow MSC: 54-XX PDFBibTeX XMLCite \textit{H. Freudenthal}, Ann. Math. (2) 43, 261--279 (1942; Zbl 0060.40006) Full Text: DOI