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About Cahit Arf 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.Biography Cahit Arf was born on 11 October 1910 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 Ecole Normale Superieure. Returning to Turkey, he taught mathematics at Galatasaray Lisesi. 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. 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. 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: Inonu 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.

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Turkey Scientists & Academicians Ranking

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Rank Name Total
3. Mimar Sinan 35016
4. Türkan Saylan 28783
5. Harun Parlar 20215
6. Oktay Sinanoğlu 13161
7. Cahit Arf 8774
8. Ali Bardakoglu 4508
9. Ahmet Taner Kışlalı 2139
10. Ilber Ortayli 1449
11. Akşemseddin 1338

Scientists & Academicians Ranking

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Rank Name Total
34. Plato 10008
35. Drauzio Varella 10000
36. Ana Aslan 9765
37. Mahfoud Kaddache 9008
38. Cahit Arf 8774
39. Jabir ibn Hayyan 7899
40. Farouk El-Baz 7690
41. Abdul Qadeer Khan 6945
42. Adib Jatene 6670

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