Cahit Arf

Cahit Arf
Cahit Arf
Born	24 October 1910; Thessaloniki, Ottoman Empire
Died	26 December 1997 (aged 87); Bebek, Istanbul, Turkey
Nationality	Turkish
Alma mater	École Normale Supérieure; University of Göttingen;
Known for	Hasse–Arf theorem; Arf invariant; Arf semigroup; Arf ring;
	Scientific career
Fields	Mathematics
Institutions	Galatasaray High School; Istanbul University; Boğaziçi University (Robert College); University of California, Berkeley; Middle East Technical University; Scientific and Technological Research Council of Turkey;
Doctoral advisor	Helmut Hasse

Cahit Arf (Turkish: [dʒaːhit aɾf]; 24 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.

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