Richard Feynman very famously does this in “Six Easy Pieces,” one of his early physics lectures. He basically explains mathematics in three pages. He starts from the number line—counting—and then he goes all the way up to precalculus. He just builds it up through an unbroken chain of logic. He doesn’t rely on any definitions. The really smart thinkers are clear thinkers. They understand the basics at a very, very fundamental level.
