"Let n be an integer."

I've been curious about this mathematician, Paul Erdos, who was the most productive math scholar since Leonhard Euler. Despite what someone might assume about mathematicians, Erdos was a humorist, too. He is incorrectly attributed as having said that a "mathematician is a machine for turning coffee into theorems," though he did drink a lot of coffee. While perusing his page on wikiquotes, I noticed this was attributed to him, "Let n be an integer."

That might not strike you as funny until you read that he always started his conversations by stating that. You might think that is pretty weird until you realize that many, if not most, math proofs start with that statement.

Happy Friday.