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.
Akhund Khorasani Mohammad Kazem Khorasani or Akhund-e Khorasani (Persian: محمد کاظم خراسانی‎ ‎ , (1839-1911)) was Twelver Shi'a Marja, politician, philosopher, reformer. He's regarded as one of the most important Shia "Mujtahid" at the time. He was a lecturer at Najaf seminary for years and significant number of students from "different regions of the Muslim world" used to participate his lectures. His most famous work is "The Sufficiency" (Arabic: کفایه‎ ‎ ) where he gathered the jurispurdential ideas such as `continuity` and "presented them in a yet more rigorous fashion as a unified theory of jurisprudence."