निकोलाय लोबाचेव्स्की

{{Infobox scientist
|name              = निकोलाय लोबाचेव्स्की<br>Nikolai Lobachevsky
|image             = Lobachevsky.jpg
|image_size        = 225px
|caption           = लेव क्रियुकोव द्वारा चित्रित (c. 1843)
|birth_date        = December 1, 1792<ref>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 {{OldStyleDate|1 December|1792|20 November}}).</ref><ref>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 December 2, 1792. Further information on Lobachevsky's birthdate can be found in: Athanase Papadopoulos (ed.), [https://books.google.com/books?id=p15epMkyx0UC&dq= ''Nikolai I. Lobachevsky. Pangeometry''], European Mathematical Society. 2010, pp. 206–7.<!-- However, note that page 207 incorrectly converts 1792-11-20 to 1792-12-02 instead of 1792-12-01 --></ref>
|birth_place       = [[Makaryevo, Nizhny Novgorod Oblast|Makaryev]],<!--spelled 'Makaryev' not 'Makaryevo' at that time--> [[Makaryevo|Makaryevsky]] [[uezd]], [[Nizhny Novgorod Oblast|Nizhny Novgorod]] [[Governorate]],<!-- [Nominative form in Russian: Макарьев, Макарьевский уезд, Нижегородская губерния; not to be confused with Makaryev, Makaryevsky uezd, Kostroma Governorate (Russian: Макарьев, Макарьевский уезд, Костромская губерния)] --><ref>See [http://www.unn.ru/math/no/4/_nom4_007_polotovsky.pdf "К 150-летию со дня смерти Н.И.Лобачевского" ("On the 150th anniversary of the death of N. Lobachevsky")] by G. M. Polotovsky, PDF page 3: "Н.И.Лобачевский родился в Макарьевском уезде Нижегородской губернии в 1793 году" (quoting A. F. Popov (1857)); page 4: "[В.Ф.Каган (1943)] местом рождения называет Макарьев".</ref><ref>Other sources in Russian—e.g., A. A. Andronov (1956)—give the city of [[Nizhny Novgorod]] rather than the Governorate as his birthplace; see also Lobachevsky's biography at the [http://www.museum.unn.ru/managfs/index.phtml?id=2305 website of the Lobachevsky Nizhny Novgorod State University Museum] {{Webarchive|url=https://web.archive.org/web/20150926011959/http://www.museum.unn.ru/managfs/index.phtml?id=2305 |date=26 सितंबर 2015 }} and Andrey Kalinin's article [http://www.museum.unn.ru/contfs/paper/2003/2014_1.phtml "Чье имя носит университет" ("After whose name the University has been named")] {{Webarchive|url=https://web.archive.org/web/20141012165120/http://www.museum.unn.ru/contfs/paper/2003/2014_1.phtml |date=12 अक्तूबर 2014 }}.</ref> [[Russian Empire]]<br>(now [[Makaryevo]], [[Nizhny Novgorod Oblast]], [[Russia]])
|death_date        = February 24, 1856 (aged 63)
|death_place       = [[Kazan]], [[Kazan Governorate]], Russian Empire<br>(now [[Tatarstan]], Russia)
|residence         = 
|citizenship       = 
|nationality       = [[Russia]]n
|field             = [[Geometry]]
|work_institutions = 
|alma_mater        = [[Kazan State University|Kazan University]]
|academic_advisors = [[Johann Christian Martin Bartels|J. C. M. Bartels]]<ref name="MG">{{MathGenealogy|id=146776}}</ref><ref>Athanase Papadopoulos (ed.), [https://books.google.com/books?id=p15epMkyx0UC&dq= ''Nikolai I. Lobachevsky. Pangeometry''], European Mathematical Society. 2010, p. 208.</ref>
|notable_students  = [[Nikolai Brashman]]<ref name="MG"/>
|known_for         = [[Lobachevskian geometry]]
|influences        = 
|influenced        = 
|awards            =
|footnotes         = 
|signature         = Nikolay Lobachevsky signature.jpg
}}

'''निकोलाय इवानोविच लोबाचेवस्की''' (Nikolai Ivanovich Lobachevsky ({{lang-rus|Никола́й Ива́нович Лобаче́вский|p=nʲikɐˈlaj ɪˈvanəvʲɪtɕ ləbɐˈtɕɛfskʲɪj|a=Ru-Nikolai_Ivanovich_Lobachevsky.ogg}}; (1 दिसम्बर 1792 – 24 फरवरी 1856) [[रूस]] के गणितज्ञ तथा ज्यामितिविद छेलै। उ अतिपरवलयिक ज्यामिति के क्षेत्र म अपनो योगदान के लेली प्रसिद्ध छै, जेकरा लोबाचेवस्की ज्यामिति (Lobachevskian geometry) भी कहै छै।<ref>{{Cite web|url=https://mathshistory.st-andrews.ac.uk/Biographies/Lobachevsky/|title=Nikolai Ivanovich Lobachevsky - Biography|website=Maths History|language=en|access-date=2021-01-28}}</ref>
निकोलाय इवानोविच लोबाचेवस्की (Nikolai Ivanovich Lobachevsky (; (1 दिसम्बर 1792 – 24 फरवरी 1856) रूस के गणितज्ञ तथा ज्यामितिविद छेलै। उ अतिपरवलयिक ज्यामिति के क्षेत्र म अपनो योगदान के लेली प्रसिद्ध छै, जेकरा लोबाचेवस्की ज्यामिति (Lobachevskian geometry) भी कहै छै।