Cahit Arf Scientist

Cahit Arf (Turkish: [d͡ʒɑhit aɾf]; 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.

Personal facts

Birth date	October 11, 1910
Birth place	Ottoman Empire , Thessaloniki
Nationality	Turkey
Date of death	December 26, 1997
Place of death	Turkey , Istanbul , Bebek Istanbul
Education	École Normale Supérieure University of Göttingen
Known for	Arf invariant