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Theyarefamouswiththeirworks in fractals. SierpinskiTriangle
Stefan Banach He was the founder of modern functional analysis.
Cahit arf 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, Arfsemigroups, and Arf rings