This week we celebrate the life of the most published mathematician in history, Paul ErdÅ‘s (AIR-dosh), who was born 100 years ago on March 26. Dr. ErdÅ‘s, who has been called the world’s greatest problem poser and solver, collaborated with over 500 mathematicians before his death in 1996.“There are still a lot of ErdÅ‘s’s vibrations going around,” says Ronald L. Graham, professor of computer science and engineering at the University of California, San Diego, and longtime ErdÅ‘s friend and collaborator. “His impact will be felt for a long time.”