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Roger Temam

{{Short description|French mathematician}}

{{Third-party|date=August 2020}}

{{Use dmy dates|date=September 2020}}

{{Infobox scientist

|name = Roger Meyer Temam

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|birth_date = {{birth date and age|1940|5|19|df=y}}

|birth_place = Tunis

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|nationality = French

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|field = Applied mathematics

|work_institutions = Paris-Sud UniversityStarting from 2020, Paris-Sud University has been replaced by the Paris-Saclay University. (Orsay)
Indiana University

|alma_mater = University of Paris

|doctoral_advisor = Jacques-Louis Lions

|doctoral_students = Etienne Pardoux, Denis Serre

|known_for = Navier–Stokes equations

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Roger Meyer Temam (born 19 May 1940) is a French mathematician and Professor of Mathematics at Indiana University Bloomington, working in the fields of numerical analysis, nonlinear partial differential equations and fluid mechanics. He is known for his contributions to the theory of the Navier–Stokes equations and to numerical analysis. He has published over 400 articles, as well as 12 (authored or co-authored) books. According to the Mathematics Genealogy Project, Temam has also supervised 127 doctoral theses,{{Cite web |title=Roger Temam - The Mathematics Genealogy Project |url=https://genealogy.math.ndsu.nodak.edu/id.php?id=11498 |access-date=2025-04-30 |website=genealogy.math.ndsu.nodak.edu}} the second-highest number supervised by an individual in the field of mathematics.{{Cite web |title=Extrema - The Mathematics Genealogy Project |url=https://genealogy.math.ndsu.nodak.edu/extrema.php |access-date=2025-04-30 |website=genealogy.math.ndsu.nodak.edu}} He has a total of 654 mathematical "descendants," including Denis Serre.

Life and education

Roger Temam (Arabic: روجي تمام) was born in Tunis, into a Jewish family.{{Cite web |last=Bensoussan |first=Alain |title=Quelques souvenirs sur Jacques-Louis Lions |url=https://acm.smai.emath.fr/congres-jllions/Bensoussan_Lions.html |access-date=2025-04-30 |website=acm.smai.emath.fr}} He moved to France at the age of 17 and enrolled at the University of Paris – the Sorbonne to study Mathematics. In 1960, he became an assistant at the Faculty{{Cite web |last=Temam |first=Roger |title=C.V. de Roger Temam - Membre de l'Académie des sciences |url=http://www.numdam.org/article/M2AN_2000__34_2_8_0.pdf}} of Mechanics of the Faculty of Sciences of Paris. There, Temam worked under the direction of Jacques-Louis Lions, earned his agrégation in mathematics in 1962, and completed his doctorate ({{lang|fr|Thèse d'Etat}}) in 1967.

After completing his studies, Temam became a Maître de Conférences (Associate Professor) and later a full Professor at the University of Paris-Sud (Orsay), where he remained until 2003. During this period, he also served as a scientific advisor at INRIA from 1968 to 1984 and at CISIA from 1974 to 2000, co-organized numerous national and international scientific events, and was a member of the editorial boards of several prestigious scientific journals, including ESAIM: Mathematical Modelling and Numerical Analysis.

In addition, Temam was a Maître de Conférences at the École Polytechnique from 1968 to 1986, co-founder and director of the Numerical Analysis Laboratory at Orsay from 1972 to 1988, director of doctoral studies in Numerical Analysis at Orsay from 1975 to 1994, and director of the Mathematics Laboratory at Orsay between 1977 and 1980. He was also a member of the scientific council of CISIA from 1989 to 1995 and served multiple terms on the National Council of Universities.

Between 1983 and 1987, Temam was a member of the National Committee for Mathematics of the CNRS, head of the "Doctoral training" expert group in mathematics, and co-founder and first president of the Société de Mathématiques Appliquées et Industrielles. He has published over 400 articles, as well as 12 (authored or co-authored) books.

Scientific work

The first work of Temam in his thesis dealt with the fractional steps method. Thereafter, "he has continually explored and developed new directions and techniques":{{cite web|url=https://www-archiv.tu-darmstadt.de/mathematik-isimm/images/laudatio_temam_isimm_prize_2016.pdf|title=Laudation for Roger Temam|last1=Grasselli|first1=Maurizio|date=June 2015|publisher=Technische Universität Darmstadt|website=The International Society for the Interaction of Mechanics and Mathematics|access-date=October 10, 2022}}

  • calculus of variations, and the notion of duality,{{sfnm|1a1=Ekeland|1a2=Témam|1y=1999}} developing the mathematical framework for discontinuous (in displacement) solutions; a concept later used for his works on the mathematical theory of plasticity;{{sfnm|1a1=Temam|1y=2018}}
  • mathematical formulation of the equilibrium of a plasma in a cavity, expressed as a nonlinear free boundary problem;R. Temam, A nonlinear eigenvalue problem: the shape at equilibrium of a confined

plasma, Arch. Rational Mech. Anal., 60, 1975, 51-73.

of the Kuramoto-Sivashinsky equations: Nonlinear stability and attractors, Physica D,

16, 1985, 155-183.

  • Euler equations in a bounded domain;R. Temam, On the Euler equations of incompressible perfect fluids, J. Funct. Anal., 20, 1975, 32-43.
  • infinite-dimensional dynamical systems theory. In particular, he studied the existence of the finite-dimensional global attractor for many dissipative equations of mathematical physics, including the incompressible Navier–Stokes equations.P. Constantin, C. Foias, O. Manley and R. Temam, Determining modes and fractal dimension of turbulent flows, J. Fluid Mech., 150, 1985, 427-440.C. Foias, O.P. Manley and R. Temam, Physical estimates of the number of degrees of freedom in free convection, Phys. Fluids, 29, 1986, 3101-3103. He was also the co-founder of the notion of inertial manifoldsC. Foias, G.R. Sell and R. Temam, Inertial manifolds for nonlinear evolutionary equations, J. Diff. Equ., 73, 1988, 309-353. together with Ciprian Foias and George R. Sell and of exponential attractors{{sfnm|1a1=Eden|1a2=Foias|1a3=Nicolaenko|1a4=Temam|1y=1994}} together with Alp Eden, Ciprian Foias and Basil Nicolaenko
  • optimal control of the incompressible Navier–Stokes equations as a tool for the control of turbulence;F. Abergel and R. Temam, On some control problems in fluid mechanics, Theoret. Comput. Fluid Dynamics, 1, 1990, 303-325.
  • boundary layer phenomena for incompressible flows.{{sfnm|1a1=Gie|1a2=Hamouda|1a3=Jung|1a4=Temam|1y=2018}}

Temam's main activities concern the study of geophysical flows, the atmosphere and oceans. This started in the 1990s by collaboration with Jacques-Louis Lions and Shouhong Wang.J.L. Lions, R. Temam and S. Wang, New formulations of the primitive equations of the atmosphere and applications, Nonlinearity, 5, 1992, 237-288.J.L. Lions, R. Temam and S. Wang, On the equations of the large-scale ocean, Nonlinearity, 5, 1992, 1007-1053.M. Coti Zelati, M. Frémond, R. Temam and J. Tribbia, Uniqueness, regularity and maximum principles for the equations of the atmosphere with humidity and saturation, Physica D, 264, 2013, 49-65, https://doi.org/10.1016/j.physd.2013.08.007Y. Cao, M. Hamouda, R. Temam, J. Tribbia and X. Wang, The equations of the multi-phase humid atmosphere expressed as a quasi variational inequality, Nonlinearity, 31, 2018, 4692-4723, https://doi.org/10.1088/1361-6544/aad525.

Of all Mathematics advisors recorded by the Mathematical Genealogy Project database, Temam has the second-largest number of doctoral students.{{Cite web|url=http://www.mathgenealogy.org/most-students.php?count=150|title = Top 150 Advisors|website=Mathematics Genealogy Project|publisher=North Dakota State University|access-date=October 10, 2022}}{{cite journal|title=The Mathematics Genealogy Project comes of age at twenty-one|journal=Notices of the American Mathematical Society|volume=65|issue=5|doi=10.1090/noti1512|first1=Colm|last1=Mulcahy|pages=466–470|date=May 2017|doi-access=free|author-link1=Colm Mulcahy}} More than 30 of his students are now full professors all over the world, and have themselves many "descendants."{{cite web|url=http://genealogy.math.ndsu.nodak.edu/id.php?id=11498|access-date=October 10, 2022|title=Roger Meyer Temam|website=Mathematics Genealogy Project|publisher=North Dakota State University}}

Administrative activities

Temam became a professor at the Paris-Sud University at Orsay in 1968. There, he co-founded the Laboratory of Numerical and Functional Analysis which he directed from 1972 to 1988. He was also a {{lang|fr|Maître de Conférences}} at the Ecole Polytechnique in Paris from 1968 to 1986.{{cite journal|url=https://www.lajauneetlarouge.com/wp-content/uploads/2015/09/jr-254-avg.pdf|journal=La Jaune et la Rouge|date=December 1970|volume=254|title=Conférences polytechniciennes. 36e série|page=37}}

In 1983, Temam co-founded the French Société de Mathématiques Appliquées et Industrielles (SMAI), analogous to the Society for Industrial and Applied Mathematics (SIAM), and served as its first president.{{Cite web|url=http://smai.emath.fr/spip.php?breve79&lang=fr|title=Historiques du CA et du bureau de la SMAI|website=Société de Mathématiques Appliquées et Industrielles|access-date=October 10, 2022}} He was also one of the founders of the International Congress on Industrial and Applied Mathematics (ICIAM) series and was the chair of the steering committee of the first ICIAM meeting held in Paris in 1987; and the chair of the standing committee of the second ICIAM meeting held in Washington, D.C., in 1991.{{Cite web|url=http://www.iciam.org/history-iciam|title = History of ICIAM|access-date=October 10, 2022|website=The International Council for Industrial and Applied Mathematics}} He was the Editor-in-Chief of the mathematical journal M2AN from 1986 to 1997.{{cite web |url=https://www.esaim-m2an.org/about-the-journal/editorial-board|access-date=October 10, 2022 |title=Editorial board |website=ESAIM: Mathematical Modelling and Numerical Analysis|series=European Series in Applied and Industrial Mathematics|publisher=EDP Sciences}}

Temam has been the Director of the Institute for Scientific Computing & Applied Mathematics (ISCAM){{Cite web|url=https://iscam.sitehost.iu.edu|access-date=October 10, 2022|title=Institute for Scientific Computing and Applied Mathematics|publisher=Indiana University Bloomington}} at Indiana University since 1986 (co-director with Ciprian Foias from 1986 to 1992). He is also a College Professor (part-time till 2003) and he has been a Distinguished Professor since 2014.{{Cite web|url=https://math.indiana.edu/about/faculty/temam-roger.html|title = Roger Temam|website=Department of Mathematics|publisher=Indiana University Bloomington|access-date=October 10, 2022}}

Books

{{refbegin|30em}}

  • {{cite book|mr=0347099|last1=Temam|first1=Roger|title=Numerical analysis|translator-first1=J. W.|translator-last1=Nienhuys|publisher=D. Reidel Publishing Company|location=Boston, MA|year=1973|translator-link1=Jan Willem Nienhuys|zbl=0261.65001|doi=10.1007/978-94-010-2565-2|isbn=978-90-277-0308-8}}
  • {{cite book|mr=0769654|last1=Temam|first1=Roger|title=Navier–Stokes equations. Theory and numerical analysis|others=With an appendix by F. Thomasset|edition=Third edition of 1977 original|series=Studies in Mathematics and its Applications|volume=2|publisher=North-Holland Publishing Company|location=Amsterdam|year=1984|isbn=0-444-87558-1|doi=10.1090/chel/343|zbl=0568.35002}}
  • {{cite book|mr=0966192|last1=Constantin|first1=P.|last2=Foias|first2=C.|last3=Nicolaenko|first3=B.|last4=Temam|first4=R.|title=Integral manifolds and inertial manifolds for dissipative partial differential equations|series=Applied Mathematical Sciences|volume=70|publisher=Springer-Verlag|location=New York|year=1989|isbn=0-387-96729-X|doi=10.1007/978-1-4612-3506-4|author-link2=Ciprian Foias|zbl=0683.58002}}
  • {{cite book|mr=1335230|last1=Eden|first1=A.|last2=Foias|first2=C.|last3=Nicolaenko|first3=B.|last4=Temam|first4=R.|title=Exponential attractors for dissipative evolution equations|series=Research in Applied Mathematics|volume=37|publisher=John Wiley & Sons, Ltd.|location=Chichester|year=1994|isbn=0-471-95223-0|author-link2=Ciprian Foias|author-link1=Alp Eden|zbl=0842.58056}}
  • {{cite book|mr=1318914|last1=Temam|first1=Roger|title=Navier–Stokes equations and nonlinear functional analysis|zbl=0833.35110|edition=Second edition of 1983 original|series=CBMS–NSF Regional Conference Series in Applied Mathematics|volume=66|publisher=Society for Industrial and Applied Mathematics|location=Philadelphia, PA|year=1995|isbn=0-89871-340-4|doi=10.1137/1.9781611970050}}
  • {{cite book|mr=1441312|last1=Temam|first1=Roger|title=Infinite-dimensional dynamical systems in mechanics and physics|edition=Second edition of 1988 original|series=Applied Mathematical Sciences|volume=68|publisher=Springer-Verlag|location=New York|year=1997|isbn=0-387-94866-X|doi=10.1007/978-1-4612-0645-3|zbl=0871.35001}}
  • {{cite book|mr=1695881|last1=Dubois|first1=Thierry|last2=Jauberteau|first2=François|last3=Temam|first3=Roger|title=Dynamic multilevel methods and the numerical simulation of turbulence|publisher=Cambridge University Press|location=Cambridge|year=1999|isbn=0-521-62165-8|zbl=0958.76002}}
  • {{cite book|mr=1727362|last1=Ekeland|first1=Ivar|last2=Témam|first2=Roger|author-link1=Ivar Ekeland|title=Convex analysis and variational problems|edition=Corrected reprint of the 1976 English edition of 1974 French original|series=Classics in Applied Mathematics|volume=28|publisher=Society for Industrial and Applied Mathematics|location=Philadelphia, PA|year=1999|isbn=0-89871-450-8|doi=10.1137/1.9781611971088|zbl=0939.49002}}
  • {{cite book|mr=1855030|last1=Foias|first1=C.|last2=Manley|first2=O.|last3=Rosa|first3=R.|last4=Temam|first4=R.|title=Navier–Stokes equations and turbulence|series=Encyclopedia of Mathematics and its Applications|volume=83|publisher=Cambridge University Press|location=Cambridge|year=2001|isbn=0-521-36032-3|doi=10.1017/CBO9780511546754|author-link1=Ciprian Foias|zbl=0994.35002}}
  • {{cite book|mr=2169020|last1=Temam|first1=Roger|last2=Miranville|first2=Alain|title=Mathematical modeling in continuum mechanics|edition=Second edition of 2001 original|publisher=Cambridge University Press|location=Cambridge|year=2005|isbn=978-0-521-61723-9|doi=10.1017/CBO9780511755422|zbl=1077.76001}}
  • {{cite book|mr=3839343|last1=Gie|first1=Gung-Min|last2=Hamouda|first2=Makram|last3=Jung|first3=Chang-Yeol|last4=Temam|first4=Roger M.|title=Singular perturbations and boundary layers|series=Applied Mathematical Sciences|volume=200|publisher=Springer, Cham|year=2018|isbn=978-3-030-00637-2|doi=10.1007/978-3-030-00638-9|zbl=1411.35002}}
  • {{cite book|last1=Temam|first1=Roger|title=Mathematical problems in plasticity|translator-last1=Orde|translator-first1=L. S.|year=2018|publisher=Dover Publications|location=Mineola, NY|isbn=978-0-486-82827-5|zbl=1406.74002|edition=Reprint of the 1985 English translation of 1983 French original|mr=0711964}}

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Awards and honors

References

{{reflist|colwidth=30em}}

External links

  • [https://scholar.google.com.au/citations?user=xzhgnosAAAAJ&hl=en Roger Temam's publications] at Google Scholar

{{Authority control}}

{{DEFAULTSORT:Temam, Roger}}

Category:University of Paris alumni

Category:Indiana University faculty

Category:Academic staff of Paris-Sud University

Category:French fluid dynamicists

Category:Living people

Category:20th-century French mathematicians

Category:21st-century French mathematicians

Category:Fellows of the American Mathematical Society

Category:Fellows of the Society for Industrial and Applied Mathematics

Category:Members of the French Academy of Sciences

Category:1940 births

Category:Variational analysts