Di Nasso, Mauro; Baglini, Lorenzo Luperi; Mennuni, Rosario; Pierobon, Moreno; Ragosta, Mariaclara Self-divisible ultrafilters and congruences in \(\beta\mathbb{Z}\). arXiv:2302.09983 Preprint, arXiv:2302.09983 [math.LO] (2023). MSC: 54D80 11A07 03H15 03C62 20E18 BibTeX Cite \textit{M. Di Nasso} et al., ``Self-divisible ultrafilters and congruences in $\beta\mathbb{Z}$'', Preprint, arXiv:2302.09983 [math.LO] (2023) Full Text: DOI arXiv OA License
Di Nasso, Mauro; Zhang, Yi Nonstandard analysis and an application to the symmetric group on natural numbers. (English) Zbl 1020.03064 Zhang, Yi (ed.), Logic and algebra. Providence, RI: American Mathematical Society (AMS). Contemp. Math. 302, 249-258 (2002). MSC: 03H05 20B30 PDFBibTeX XMLCite \textit{M. Di Nasso} and \textit{Y. Zhang}, Contemp. Math. 302, 249--258 (2002; Zbl 1020.03064)