Cahit Arf
Cahit Arf  

Born  Selanik (Thessaloniki), Ottoman Empire 
October 11, 1910
Died  December 26, 1997 Bebek, Istanbul, Turkey 
(aged 87)
Nationality  Turkish 
Fields  Mathematics 
Institutions  Middle East Technical University UC Berkeley Institute for Advanced Study Istanbul University 
Alma mater  École Normale Supérieure University of Göttingen 
Doctoral advisor  Helmut Hasse 
Known for  Arf invariant 
This article is part of a series on Cahit Arf 


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Cahit Arf (11 October 1910 – 26 December 1997) was a Turkish mathematician. He is known for the Arf invariant of a quadratic form in characteristic 2 (applied in knot theory and surgery theory) in topology, the Hasse–Arf theorem in ramification theory, Arf semigroups, and Arf rings.
Contents
Biography
Cahit Arf was born on 11 October 1910^{1} in Selanik (Thessaloniki), which was then a part of the Ottoman Empire. His family migrated to Istanbul with the outbreak of the Balkan War in 1912. The family finally settled in İzmir where Cahit Arf received his primary education. Upon receiving a scholarship from the Turkish Ministry of Education he continued his education in Paris and graduated from École Normale Supérieure.
Returning to Turkey, he taught mathematics at Galatasaray High School. In 1933 he joined the Mathematics Department of Istanbul University. In 1937 he went to Göttingen, where he received his PhD from the University of Göttingen and he worked with Helmut Hasse and Josue Cruz de Munoz. He returned to Istanbul University and worked there until his involvement with the foundation work of Scientific and Technological Research Council (TÜBİTAK) upon President Cemal Gursel's appointment in 1962. After serving as the founding director of the council in 1963, he joined the Mathematics Department of Robert College in Istanbul. Arf spent the period of 1964–1966 working at the Institute for Advanced Study in Princeton, New Jersey.^{2} He later visited University of California, Berkeley for one year.
Upon his final return to Turkey, he joined the Mathematics Department of the Middle East Technical University and continued his studies there until his retirement in 1980. Arf received numerous awards for his contributions to mathematics, among them are: İnönü Award in 1948, Scientific and Technological Research Council of Turkey (TÜBİTAK) Science Award in 1974, and Commandeur des Palmes Academiques (France) in 1994. Arf was a member of the Mainz Academy and the Turkish Academy of Sciences. He was the president of the Turkish Mathematical Society from 1985 until 1989. Arf died on December 26, 1997 in Bebek, Istanbul, at the age of 87. His collected works were published, in 1988, by the Turkish Mathematical Society.
Influence
Arf's influence on Science in general and Mathematics in particular was profound. Although he had very few formal students, many of the mathematicians of Turkey, at some time of their careers, had fruitful discussions on their field of interest with him and had received support and encouragement.
He facilitated the nowcelebrated visit of Robert Langlands to Turkey (now famous for the Langlands program, among many other things); during which Langlands worked out some arduous calculations on the epsilon factors of Artin Lfunctions.
Arf's portrait is depicted on the reverse of the Turkish 10 lira banknote issued in 2009.^{3}
Middle East Technical University Department of Mathematics organizes a special lecture session called the Cahit Arf lecture each year in memory of Arf.
Cahit Arf Lectures
Previous Cahit Arf lectures held at Middle East Technical University include:
 2011: Jonathan Pila of University of Oxford: Diophantine Geometry via Ominimality
 2010: John W Morgan of Stony Brook University, Simons Center for Geometry and Physics
 2009: Ben Joseph Green of University of Cambridge
 2008: Gunter Harder of Mathematisches Institut der Universitat Bonn
 2007: Hendrik Lenstra of Universiteit Leiden Mathematisch Instituut
 2006: JeanPierre Serre of Collège de France
 2005: Peter Sarnak of Princeton University and the Institute for Advanced Study
 2004: Robert Langlands of the Institute for Advanced Study
 2003: David Mumford of Brown University Division of Applied Mathematics
 2002: Don Zagier of University of Utrecht / Collège de France
 2001: Gerhard Frey of University of Essen Institute for Experimental Mathematics
See also
Notes
 ^ http://turnbull.mcs.stand.ac.uk/history/Biographies/Arf.html
 ^ Institute for Advanced Study: A Community of Scholars
 ^ Central Bank of the Republic of Turkey. Banknote Museum: 9. Emission Group – Ten Turkish Lira – I. Series. – Retrieved on 20 April 2009.
References
 Arf, Cahit (1990), The collected papers of Cahit Arf, Turkish Mathematical Society
 Ikeda, Masatoshi G. (1998), "Cahit Arf's contribution to algebraic number theory and related fields", Turkish Journal of Mathematics 22 (1): 1–14, ISSN 13000098, MR 1631730
 Sertöz, Ali Sinan (16 January 2013), A scientific biography of Cahit Arf (19101997)
 Terzioğlu, Tosun; Yılmaz, A. (2005), Anlamak tutkunu bir matematikçi: Cahit Arf, TÜBA
 Tonta, Yaşar; Özkan Çelik, A. Esra. (2013), "Cahit Arf: Exploring His Scientific Influence Using Social Network Analysis, Author Cocitation Maps and Single Publication h Index", Journal of Scientometric Research 2 (1): 37–51.
Further reading
 Roquette, Peter (2013), "Cahit Arf and his invariant", Contributions to the history of number theory in the 20th century, Heritage of European Mathematics, Zürich: European Mathematical Society, pp. 189–222, ISBN 9783037191132, Zbl 1276.11001
External links
 Cahit Arf Lectures homepage
 Page and links on Cahit Arf
 O'Connor, John J.; Robertson, Edmund F., "Cahit Arf", MacTutor History of Mathematics archive, University of St Andrews.
 Cahit Arf at the Mathematics Genealogy Project

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