George Pólya Quote

The traditional mathematics professor of the popular legend is absentminded. He usually appears in public with a lost umbrella in each hand. He prefers to face a blackboard and to turn his back on the class. He writes a, he says b, he means c, but it should be d.

How to Solve It: A New Aspect of Mathematical Method, Part III, The Traditional Mathematics Professor (p. 208), Princeton University Press. 1973