Who did more ring theory, Cahit Arf or Sind ibn Ali?
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.
Sharik Ibn-e-Judair Sharik Ibn Judair was a Sahabi of Ali and fought for him in Battle of Siffin. He was also very close to the Malik al-Ashtar. According to some traditions, he was killed by Hussain Ibn Numayer in a fight with Ubaidullah Ibn Ziyad with Mukhtar-e-Thaqafi.