Koru Yükekaya, Gülay; Aktaş, Kevser; Yayli, Yusuf Lorentzian Pythagorean triples and Lorentzian unit circle. (English) Zbl 1316.53013 Math. Aeterna 3, No. 1, 1-8 (2013). MSC: 53A35 51M99 PDFBibTeX XMLCite \textit{G. Koru Yükekaya} et al., Math. Æterna 3, No. 1, 1--8 (2013; Zbl 1316.53013)
Kalimuthu, S. On Gödel’s incompleteness theorems. (English) Zbl 1307.51008 Math. Aeterna 1, No. 5, 313-316 (2011). Reviewer: Olaf Teschke (Berlin) MSC: 51M04 PDFBibTeX XMLCite \textit{S. Kalimuthu}, Math. Æterna 1, No. 5, 313--316 (2011; Zbl 1307.51008)
Barbu, Cătălin; Pişcoran, Laurian-Ioan Gülicher’ theorem in the Poincaré disc model of hyperbolic geometry. (English) Zbl 1308.51013 Math. Aeterna 1, No. 5, 305-311 (2011). MSC: 51K05 51M10 30F45 20N99 51B10 PDFBibTeX XMLCite \textit{C. Barbu} and \textit{L.-I. Pişcoran}, Math. Æterna 1, No. 5, 305--311 (2011; Zbl 1308.51013)