I am going to give what I will call an elementary demonstration. But elementary does not mean easy to understand. Elementary…

“I am going to give what I will call an elementary demonstration. But elementary does not mean easy to understand. Elementary means that very little is required to know ahead of time in order to understand it, except to have an infinite amount of intelligence. There may be a large number of steps that hard to follow, but to each does not require already knowing the calculus or Fourier transforms.”

–Richard P. Feynman