Cahit Arf
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Cahit Arf was a Turkish mathematician. He is known for the Arf invariant of a quadratic form in characteristic 2 in topology, the Hasse–Arf theorem in ramification theory, Arf semigroups and Arf rings
Cahit Arf 10 lira
Reverse of the 10 lira banknote (2009)
Gravestone of Cahit Arf, Zincirlikuyu Cemetery, Istanbul
Robert Langlands
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Robert Phelan Langlands is a Canadian mathematician. He is best known as the founder of the Langlands program, a vast web of conjectures and results connecting representation theory and automorphic fo
Cahit Arf
…had fruitful discussions on their field of interest with him and had received support and encouragement. He facilitated the now-celebrated visit of Robert Langlands to Turkey (now famous for the Langlands program, among many other things); during which Langlands worked out some arduous calculations on the epsilon…
Langlands in front of chalkboard