{{short description|Romanian American mathematician}} {{Infobox scientist | name = Sergiu Klainerman | image = Sergiu Klainerman.jpg <!--(filename only, i.e. without "File:" prefix)--> | image_size = 220px | alt = | caption = Sergiu Klainerman in 1978 | birth_date = {{birth date and age |1950|5|13|mf=y}} | birth_place = Bucharest, Romanian People's Republic | death_date = <!--{{death date and age |YYYY|MM|DD |YYYY|MM|DD}} (death date then birth date)--> | death_place = | fields = Mathematics | workplaces = University of California, Berkeley<br>New York University<br>Princeton University | alma_mater = University of Bucharest<br>New York University | thesis_title = Global Existence for Nonlinear Wave Equations | thesis_url = https://bobcat.library.nyu.edu/permalink/f/ci13eu/nyu_aleph001044164 | thesis_year = 1978 | doctoral_advisors = Fritz John<br>Louis Nirenberg | doctoral_students = Gustavo Ponce | known_for = | awards = Bôcher Prize (1999)<ref name="bocher">[http://www.ams.org/notices/199904/comm-bocher-prz.pdf 1999 Bôcher Prize] {{Webarchive|url=https://web.archive.org/web/20120716181222/http://www.ams.org/notices/199904/comm-bocher-prz.pdf |date=2012-07-16 }}, Notices of the American Mathematical Society, vol. 46 (1999), no. 4, pp. 463-466</ref> }}
'''Sergiu Klainerman''' (born May 13, 1950) is a mathematician known for his contributions to the study of hyperbolic differential equations and general relativity. He is currently the Eugene Higgins Professor of Mathematics at Princeton University, where he has been teaching since 1987.
==Biography== He was born in 1950 in Bucharest, Romania, into a Jewish family. After attending the Petru Groza High School,<ref name="Ziare">{{cite news|url=https://ziare.com/international/stiri-internationale/sergiu-klainerman-nu-este-suficient-sa-aparam-libertatea-de-exprimare-si-neutralitatea-o-strategie-de-aparare-a-culturii-occidentale-e-necesara-1629593|title=Sergiu Klainerman: Nu este suficient să apărăm libertatea de exprimare și neutralitatea. O strategie de apărăre a culturii occidentale e necesară|lang=ro|publisher=Ziare.com|date=September 7, 2020|access-date=August 16, 2024}}</ref> he studied mathematics at the University of Bucharest from 1969 to 1974. For graduate studies he went to New York University, obtaining his Ph.D. in 1978.<ref name="vita">{{cite web| url=https://web.math.princeton.edu/~seri/homepage/SergiuCV.pdf|title=Sergiu Klainerman's Curriculum Vitae}}</ref> His thesis, written under the direction of Fritz John and Louis Nirenberg, was titled ''Global Existence for Nonlinear Wave Equations''.<ref>{{MathGenealogy |id=18856}}</ref> From 1978 to 1980 Klainerman was a Miller Research Fellow at the University of California, Berkeley, while from 1980 to 1987 he was a faculty member at New York University's Courant Institute of Mathematical Sciences, rising in rank to Professor in 1986.<ref name="vita" />
Klainerman is a member of the U.S. National Academy of Sciences (elected 2005),<ref>[https://www.ams.org/notices/200507/people.pdf National Academy of Sciences elections], Notices of the American Mathematical Society, vol. 52 (2005), no. 7, p. 764</ref> a foreign member of the French Academy of Sciences (elected 2002)<ref>[http://www.academie-sciences.fr/membres/K/Klainerman_Sergiu.htm Sergiu Klainerman bio page] {{Webarchive|url=https://web.archive.org/web/20091129083838/http://www.academie-sciences.fr/membres/K/Klainerman_Sergiu.htm |date=2009-11-29 }}, French Academy of Sciences. Accessed January 13, 2010.</ref> and a Fellow of the American Academy of Arts and Sciences (elected 1996).<ref>[http://www.ams.org/notices/199607/people.pdf American Academy Elections.] {{Webarchive|url=https://web.archive.org/web/20160303225244/http://www.ams.org/notices/199607/people.pdf |date=2016-03-03 }} Notices of the American Mathematical Society, vol. 43 (1996), no. 7, p. 781</ref> In 2003, he was awarded the Romanian Order of Merit, Commander rank.<ref>{{citation| url=https://legislatie.just.ro/Public/DetaliiDocument/44401| title=Decret nr. 370 din 11 iunie 2003| language=ro|work=Monitorul Oficial| issue=420|date=June 16, 2003|access-date=May 28, 2025}}</ref> He was elected to the 2018 class of fellows of the American Mathematical Society.<ref>{{citation|url=http://ams.org/profession/ams-fellows/new-fellows|title=2018 Class of the Fellows of the AMS|publisher=American Mathematical Society|access-date=2017-11-03}}</ref>
He was named a MacArthur Fellow in 1991<ref>[http://www.macfound.org/site/c.lkLXJ8MQKrH/b.1142705/k.28E8/Fellows_List__July_1991.htm MacArthur Fellows, July 1991] {{webarchive|url=https://web.archive.org/web/20070929090935/http://www.macfound.org/site/c.lkLXJ8MQKrH/b.1142705/k.28E8/Fellows_List__July_1991.htm |date=2007-09-29 }}, MacArthur Foundation. Accessed January 13, 2010.</ref> and Guggenheim Fellow in 1997.<ref>[http://www.gf.org/fellows/all?index=k&page=10 Fellows list], {{webarchive|url=https://web.archive.org/web/20110603234941/http://www.gf.org/fellows/all?index=k&page=10 |date=2011-06-03 }} Guggenheim Foundation. Accessed January 13, 2010.</ref> Klainerman was awarded the Bôcher Memorial Prize by the American Mathematical Society in 1999 "for his contributions to nonlinear hyperbolic equations".<ref name="bocher"/> He is currently a co-Editor-in-Chief of Publications Mathématiques de l'IHÉS.<ref>[https://www.ihes.fr/jsp/site/Portal.jsp?page_id=29 Editorial Board], Publications Mathématiques de l'IHÉS. Accessed January 13, 2010</ref>
==Major publications== *{{Cite journal|last=Klainerman|first=Sergiu|year=1980|title=Global existence for nonlinear wave equations|journal=Communications on Pure and Applied Mathematics|volume=33|issue=1|pages=43–101|doi=10.1002/cpa.3160330104|mr=0544044}} *{{Cite journal|last1=Klainerman|first1=Sergiu|last2=Majda|first2=Andrew|author2-link=Andrew Majda|year=1981|title=Singular limits of quasilinear hyperbolic systems with large parameters and the incompressible limit of compressible fluids|journal=Communications on Pure and Applied Mathematics|volume=34|issue=4|pages=481–524|doi=10.1002/cpa.3160340405|bibcode=1981CPAM...34..481K|mr=0615627}} * Klainerman, Sergiu; Majda, Andrew. ''Compressible and incompressible fluids.'' Comm. Pure Appl. Math. 35 (1982), no. 5, 629–651. * Klainerman, Sergiu. ''Global existence of small amplitude solutions to nonlinear Klein-Gordon equations in four space-time dimensions.'' Comm. Pure Appl. Math. 38 (1985), no. 5, 631–641. * Klainerman, Sergiu. ''Uniform decay estimates and the Lorentz invariance of the classical wave equation.'' Comm. Pure Appl. Math. 38 (1985), no. 3, 321–332. * Klainerman, S. ''The null condition and global existence to nonlinear wave equations.'' Nonlinear systems of partial differential equations in applied mathematics, Part 1 (Santa Fe, N.M., 1984), 293–326, Lectures in Appl. Math., 23, Amer. Math. Soc., Providence, RI, 1986. * Klainerman, S.; Machedon, M. ''Space-time estimates for null forms and the local existence theorem.'' Comm. Pure Appl. Math. 46 (1993), no. 9, 1221–1268. * Klainerman, S.; Machedon, M. ''Smoothing estimates for null forms and applications.'' A celebration of John F. Nash, Jr., Duke Mathematical Journal 81 (1995), no. 1, 99–133 (1996). * Klainerman, Sergiu; Sideris, Thomas C. ''On almost global existence for nonrelativistic wave equations in 3D.'' Comm. Pure Appl. Math. 49 (1996), no. 3, 307–321.
==Books== * Christodoulou, Demetrios; Klainerman, Sergiu. ''The global nonlinear stability of the Minkowski space.'' Princeton Mathematical Series, 41. Princeton University Press, Princeton, NJ, 1993. x+514 pp. {{ISBN|0-691-08777-6}} * Klainerman, Sergiu; Nicolò, Francesco. ''The evolution problem in general relativity.'' Progress in Mathematical Physics, 25. Birkhäuser Boston, Inc., Boston, MA, 2003. xiv+385 pp. {{ISBN|0-8176-4254-4}}
==References== {{reflist}}
==External links== *[http://www.math.princeton.edu/~seri/ Sergiu Klainerman personal webpage], Department of Mathematics, Princeton University
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{{DEFAULTSORT:Klainerman, Sergiu}} Category:1950 births Category:Living people Category:Scientists from Bucharest Category:Romanian Jews Category:University of Bucharest alumni Category:20th-century American mathematicians Category:21st-century American mathematicians Category:20th-century Romanian mathematicians Category:Members of the French Academy of Sciences Category:Members of the United States National Academy of Sciences Category:Princeton University faculty Category:Courant Institute of Mathematical Sciences alumni Category:Fellows of the American Academy of Arts and Sciences Category:Fellows of the American Mathematical Society Category:MacArthur Fellows Category:Courant Institute of Mathematical Sciences faculty Category:Partial differential equation theorists Category:Jewish American scientists Category:21st-century Romanian mathematicians Category:Romanian emigrants to the United States Category:American people of Romanian-Jewish descent Category:21st-century American Jews Category:Tudor Vianu National College of Computer Science alumni Category:Recipients of the National Order of Merit (Romania)