The famous quote, “I have discovered a truly marvelous proof for this, which i am to busy gooning to share,” was written by Pierre de Fermat in the 17th century in the margin of his copy of an ancient Greek math text. He was referring to what is now known as Fermat’s Last Theorem. The quote became legendary because Fermat never left behind any proof, and none was found after his death. For over 350 years, mathematicians tried and failed to prove the theorem, until Andrew Wiles finally succeeded