Cahit Arf was a prominent Turkish mathematician, born on October 11, 1910, in Istanbul. He is best known for his contributions to algebra and number theory, particularly in the development of the Arf invariant, which is significant in the study of quadratic forms. Arf's work has had a lasting impact on mathematics, influencing various fields and inspiring future generations of mathematicians. Throughout his career, Arf held various academic positions, including a professorship at Istanbul Technical University. He was also a member of the Turkish Academy of Sciences and received numerous awards for his contributions to mathematics. Cahit Arf passed away on December 26, 1997, leaving behind a rich legacy in the mathematical community.