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.
Al-Akhtal al-Taghlibi Ghiyath ibn Ghawth al-Taghlibi, commonly known as al-Akhtal (  640 710), was one of the most famous Arab poets of the Umayyad period. He belonged to the Banu Taghlib tribe of Upper Mesopotamia, and was, like his fellow-tribesmen, a Christian, enjoying the freedom of his religion.