- Serge Lang
Infobox Scientist

name = Serge Lang

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caption = Serge Lang (1927-2005)

birth_date = birth date|1927|5|19

birth_place =Paris ,France

death_date = death date and age|2005|9|12|1927|5|19

death_place =Berkeley, California

residence =United States

citizenship =French American

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field =Mathematics

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known_for = Work innumber theory

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footnotes =**Serge Lang**(May 19 ,1927 –September 12 ,2005 ) was a French-born Americanmathematician . He was known for his work innumber theory and for his mathematicstextbook s, including the influential "Algebra". He was a member of theBourbaki group.He was born in

Paris in 1927, and moved with his family to California as a teenager, where he graduated in 1943 fromBeverly Hills High School . He subsequently graduated from Caltech in 1946, and received a doctorate fromPrinceton University in 1951. He had positions at theUniversity of Chicago andColumbia University (from 1955, leaving in 1971 in a dispute). At the time of his death he wasprofessor emeritus of mathematics atYale University .**Mathematical work**He was a student of

Emil Artin at Princeton University. His thesis was onquasi-algebraic closure . He then worked on the geometric analogues ofclass field theory anddiophantine geometry . Later he moved intodiophantine approximation andtranscendence theory .A break in research while he was involved in trying to meet 1960s student activism halfway caused him (by his own description) difficulties in picking up the threads afterwards. He wrote on

modular form s andmodular unit s, the idea of a 'distribution' on aprofinite group , andvalue distribution theory .He made a number of conjectures in diophantine geometry:

Mordell-Lang conjecture ,Bombieri-Lang conjecture ,Lang's integral point conjecture ,Lang-Trotter conjecture ,Lang conjecture on Gamma values ,Lang conjecture on analytically hyperbolic varieties .**Books**He was a prolific writer of mathematical texts, often completing one on his summer vacation. Most are at graduate level and aimed at those intending research in

number theory . He wrotecalculus texts and also prepared a book ongroup cohomology for Bourbaki.Lang's "Algebra", a graduate-level introduction to

abstract algebra , was a highly influential text that ran through numerous updated editions. His Steele prize citation stated, "Lang's "Algebra" changed the way graduate algebra is taught...It has affected all subsequent graduate-level algebra books." It contained ideas of his teacher, Artin; some of the most interesting passages in "Algebraic Number Theory" also reflect Artin's influence and ideas that might otherwise not have been published in that or any form.In Lang's obituary article in the "

Yale Daily News ", colleague Peter Jones said that Lang's work is believed to have surpassed the record total output ofLeonhard Euler , a prolific 18th century mathematician. [*http://www.yaledailynews.com/Article.aspx?ArticleID=29843*]**Awards as expositor**Lang was noted for his eagerness for contact with students. Many of his students at Yale considered him to be one of the greatest teachers of mathematics in the world. He won a

Leroy P. Steele Prize for Mathematical Exposition (1999) from theAmerican Mathematical Society . In 1960, he won the sixth Frank Nelson Cole Prize in Algebra for his paper "Unramified class field theory over function fields in several variables" (Annals of Mathematics, Series 2, volume 64 (1956), pp. 285-325).**Activism**In addition to being a mathematician, Lang spent much of his time engaged in politics. He was active in opposition to the Vietnam War. He volunteered in the 1966 anti-war campaign of

Robert Scheer (and later wrote a book about it entitled "The Scheer Campaign"). He later quit his position at Columbia in 1971 over the university's treatment of anti-war protesters.He was also engaged in several "whistle blowing" crusades to challenge anyone he believed was spreading misinformation or misusing science or mathematics to further their own goals.

He attacked the

1977 Survey of the American Professoriate , an opinion questionnaire thatSeymour Martin Lipset andE. C. Ladd had sent to thousands of college professors in the United States, accusing it of containing numerous biased and loaded questions. This led to a public and highly acrimonious conflict.In 1986, he challenged the nomination of political scientist

Samuel P. Huntington to the National Academy of Sciences, claiming that his research consisted of "political opinions masquerading as science". The challenge was successful.Lang kept his political correspondence and related documentation in extensive "files". He would send letters or publish articles, wait for responses, engage the writers in further correspondences, collect all these writings together and point out what he considered contradictions. He often mailed these files to people he considered important; some of them were also published in his books "Challenges" (ISBN 0-387-94861-9) and "The File" (ISBN 0-387-90607-X). His extensive file on the alleged scientific misconduct of

Nobel laureateDavid Baltimore was published in the journal "Ethics and Behaviour" in January 1993 [*http://www.gatewaycoalition.org/files/Gateway_Project_Moshe_Kam/Resource/DBCre/serge.html*] .His most controversial political stance was as an

AIDS denialist ; he maintained that the prevailing scientific consensus thatHIV causesAIDS has not been backed up by reliable scientific research, yet for political/commercial reasons further research questioning the current point of view is suppressed. In public he was very outspoken about this point and a portion of "Challenges" is devoted to this issue.Later in his life, Lang expanded his "challenges" to include the humanities. For example, he fought the decision by Yale University to hire

Daniel Kevles , a historian of science, because he disagreed with Kevles' book "The Baltimore Case".**Books**

* "Introduction to Algebraic Geometry" (1958)

* "Abelian Varieties" (1959)

* "Diophantine Geometry" (1962)

* "Introduction To Differentiable Manifolds" (1962)

* "A First Course in Calculus" (1964), as "Short Calculus" (2001)

* "Algebraic Numbers" (1964)

* "A Second Course in Calculus" (1965)

* "Algebra" (1965) and many later editions

* "Algebraic Structures" (1966)

* "Introduction to Diophantine Approximations" (1966)

* "Introduction to Transcendental Numbers" (1966)

* "Linear Algebra" (1966)

* "Rapport sur la Cohomologie des Groupes" (1966) as "Topics in Cohomology of Groups" (1986)

* "A Complete Course in Calculus" (1968)

* "Analysis I" (1968)

* "Analysis II" (1969)

* "Real Analysis" (1969)

* "Algebraic Number Theory" (1970)

* "Introduction To Linear Algebra" (1970)

* "Basic Mathematics" (1971)

* "Differential Manifolds" (1972)

* "Introduction to Algebraic and Abelian Functions" (1972)

* "Calculus of Several Variables" (1973)

* "Elliptic Functions" (1973)

* "SL_{2}(R)" (1975)

* "Complex Analysis" (1977)

* "Cyclotomic Fields" (1978)

* "Elliptic Curves: Diophantine Analysis" (1978)

* "Modular Units" (1981) with Dan Kubert

* "The File: Case Study in Correction 1977-1979" (1981)

* "Undergraduate Analysis" (1983)

* "Complex Multiplication" (1983)

* "Fundamentals Of Diophantine Geometry" (1983)

* "The Beauty of Doing Mathematics: Three Public Dialogues" (1985)

* "Math!: Encounters with High School Students" (1985)

* "Riemann-Roch Algebra" (1985) withWilliam Fulton

* "Introduction to Modular Forms" (1987)

* "Introduction To Complex Hyperbolic Spaces" (1987)

* "Geometry" (1988)

* "Introduction to Arakelov Theory" (1988)

* "Cyclotomic Fields II" (1989)

* "Undergraduate Algebra" (1990)

* "Real and Functional Analysis" (1993)

* "Differential and Riemannian Manifolds" (1995)

* "Basic Analysis of Regularized Series and Products" (1993) with Jay Jorgenson

* "Challenges" (1997)

* "Survey On Diophantine Geometry" (1997)

* "Fundamentals of Differential Geometry" (1999)

* "Math Talks for Undergraduates" (1999)

* "Problems and Solutions for Complex Analysis" (1999) with Rami Shakarchi

* "Collected Papers I: 1952-1970" (2000)

* "Collected Papers II: 1971-1977" (2000)

* "Collected Papers III: 1978-1990" (2000)

* "Collected Papers IV: 1990-1996" (2000)

* "Spherical Inversion on SL_{n}" (2001) with Jay Jorgenson

* "Pos_{n}(R) and Eisenstein Series" (2005) with Jay Jorgenson**References*** [

*http://www.ams.org/notices/199904/comm-steele-prz.pdf Steele Prize citation and Lang's acceptance (AMS Notices 1999)*]

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***External links***

* [*http://www.nytimes.com/2005/09/25/national/25lang.html?ei=5088&en=81b37e507db355b7&ex=1285300800&adxnnl=1&partner=rssnyt&emc=rss&adxnnlx=1204604167-mvg0pZd6vywvi9s2Z/sK1A Obituary*] from the "New York Times "

* [*http://www.dipmat.unipg.it/~mamone/sci-dem/archivio/la-li.pdf Interview with Serge Lang*] by Anthony Liversidge (1993). Lang describes at length his method of File making.

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