Definitions and explanations of key terms used throughout the site.
A logical demonstration establishing the truth of a proposition or claim.
The first of these schemes derives from the fact that the generally accepted "flat earth" was, all of a sudden, proved to be a sphere by the voyage of Magellan's ships around the world.
Source: JFK by L. Fletcher Prouty
You got something to prove, tell me, whose eyes you gonna use?
I Was Just Guessing at Numbers and Figures
Nobody said it was easy. No one ever said it would be so hard. I’m going back to the start.