Editing Cahit Arf (section)

{{Short description|Turkish mathematician (1910–1997)}}
{{Infobox scientist
| name              = Cahit Arf
| image             = Cahit Arf.jpg
| image_size        = 240px
| caption           = <!--  Cahit Arf, probably in front of [[Middle East Technical University|METU]] Department of Mathematics. -->
| birth_date        = {{Birth date|1910|10|24|df=y}}
| birth_place       = [[Thessaloniki]], [[Ottoman Empire]]
| nationality       = [[Turkey|Turkish]]
| death_date        = {{death date and age|1997|12|26|1910|10|24|df=y}}
| death_place       = [[Bebek, Istanbul|Bebek]], [[Istanbul]], [[Turkey]]
| field             = [[Mathematics]]
| workplaces        = {{Bulleted list |[[Galatasaray High School]] |[[Istanbul University]] |[[Boğaziçi University|Robert College]] |[[University of California, Berkeley]] |[[Middle East Technical University]] |[[Scientific and Technological Research Council of Turkey]] }}
| alma_mater        = {{Bulleted list |[[École Normale Supérieure]] |[[University of Göttingen]] }}
| doctoral_advisor  = [[Helmut Hasse]]
| known_for         = *[[Hasse–Arf theorem]]
* [[Arf invariant]]
* [[Arf semigroup]]
* [[Arf ring]]
| footnotes         = 
}}
'''Cahit Arf''' ({{IPA|tr|dʒaːhit aɾf|lang}}; 24 October 1910 &ndash; 26 December 1997) was a [[Turkish people|Turkish]] [[mathematician]]. He is known for the [[Arf invariant]] of a [[quadratic form]] in [[characteristic (algebra)|characteristic]] 2 (applied in [[knot theory]]  and [[surgery theory]]) in  [[topology]], the [[Hasse&ndash;Arf theorem]] in [[ramification theory]], [[Arf semigroup]]s and [[Arf ring]]s.