Paul Erdos
Paul Erdős (Hungarian: Erdős Pál [ˈɛrdøːʃ paːl]; 26 March 1913 – 20 September 1996) was a Jewish-Hungarian mathematician. He was one of the most prolific mathematicians of the 20th century, but also known for his social practice of mathematics (more than 500 collaborators) and eccentric lifestyle (Time magazine called him The Oddball's Oddball). Erdős pursued problems in combinatorics, graph theory, number theory, classical analysis, approximation theory, set theory, and probability theory.