↑ This is the date given by V. F. Kagan's 1957 book N. Lobachevsky and His Contribution to Science (first published in Russian in 1943), p. 26, and A. A. Andronov's 1956 article "Где и когда родился Н.И.Лобачевский" ("Where and when was Lobachevsky born?") (the latter gives 1 December [lịch cũ 20 November] năm 1792).
↑ Older sources in Russian—e.g., A. F. Popov, "Воспоминания о службе и трудах проф. Казанского университета Н. И. Лобачевского" ("Memoirs of the Service and Work of N. I. Lobachevsky"), 1857—give 1793 rather than 1972, while the Dictionary of Scientific Biography (1970) gives ngày 2 tháng 12 năm 1792. Further information on Lobachevsky's birthdate can be found in: Athanase Papadopoulos (ed.), Nikolai I. Lobachevsky. Pangeometry, European Mathematical Society. 2010, pp. 206–7.
↑ This is a quote from G. B. Halsted's translator's preface to his 1914 translation of The Theory of Parallels: "What Vesalius was to Galen, what Copernicus was to Ptolemy that was Lobachevsky to Euclid." — W. K. Clifford
1 2 3 4 5 Victor J. Katz. A history of mathematics: Introduction. Addison-Wesley. 2009. p. 842.
↑ Ivan Maksimovich Lobachevsky (Jan Łobaczewski in Polish) came from a Polish noble family of Jastrzębiec và Łada coats of arms, and was classified as a Pole in Russian official documents; Jan Ciechanowicz. Mikołaj Łobaczewski - twórca pangeometrii. Rocznik Wschodni. Issue 7–9. 2002. p. 163.
↑ Bardi, Jason (2008). The Fifth Postulate: How Unraveling a Two Thousand Year Old Mystery Unraveled the Universe. John Wiley & Sons. tr. 186. ISBN978-0-470-46736-7. His stubbornness, reported atheism, and genius supported his rise as a champion of the proletariat. To the Soviets, Lobachevsky represented not just the greatness of the common man, emerging from a humble background as he did, he also was a revolutionary of sorts.
↑ “The History of Science”. Soviet Science. Taylor & Francis. tr. 329. Though Lobachevsky appears to have invented non-Euclidean geometry without the help of the Almighty, he built a church on the instructions of the University council. It is said that he was an atheist. ||ngày truy cập= cần |url= (trợ giúp)
