Knowing what is big and what is small is more important than being able to solve partial differential equations.
Stanislaw UlamIn many cases, mathematics is an escape from reality. The mathematician finds his own monastic niche and happiness in pursuits that are disconnected from external affairs. Some practice it as if using a drug.
Stanislaw UlamIt is still an unending source of surprise for me how a few scribbles on a blackboard or on a piece of paper can change the course of human affairs.
Stanislaw UlamHe [John von Neumann] had the invaluable faculty of being able to take the most difficult problem and separate it into its components, whereupon everything looked brlliantly simple.
Stanislaw Ulam