Ocupation: Professor
Life: b. September 24, 1945
Birthday: September 24
Mathematicians need proofs to keep them honest. All technical areas of human activity need reality checks. It is not enough to believe that something works, that it is a good way to proceed, or even that it is true. We need to know why it's true. Otherwise, we won't know anything at all.
source: Ian Stewart (2007). “Letters to a Young Mathematician”, p.79, Basic Books
topic: Believe, Reality, Needs, Human Activity