| Cem Yalçın Yıldırım | |
| Birth Date: | 8 July 1961 |
| Citizenship: | Republic of Turkey |
| Nationality: | Turkish |
| Fields: | Mathematics |
| Workplaces: | Bilkent University Boğaziçi University |
| Alma Mater: | Middle East Technical University (BSc, 1982) University of Toronto (PhD, 1990) |
| Doctoral Advisor: | John Friedlander |
| Awards: | Cole Prize (2014) |
| Website: | math.boun.edu.tr/../yildirim.htm |
Cem Yalçın Yıldırım (born 8 July 1961)[1] is a Turkish mathematician who specializes in number theory.
Yıldırım obtained his B.Sc from Middle East Technical University in Ankara, Turkey and his PhD from the University of Toronto in 1990.[2] His advisor was John Friedlander. He is currently a faculty member at Boğaziçi University in Istanbul, Turkey.
In 2009, Dan Goldston, János Pintz, and Yıldırım proved that for any positive number ε there exist primes p and p′ such that the difference between p and p′ is smaller than ε log p.[3] This result was originally reported in 2003 by Goldston and Yıldırım but was later retracted.[4] [5] Then Janos Pintz joined the team and they completed the proof in 2005 and developed the so called GPY sieve.