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  4. Richard P. Feynman
  5. A great deal more is known than has been proved.

A great deal more is known than has been proved.

Richard P. Feynman
Math, Deals, Has Beens
"The Music of the Primes : Searching to Solve the Greatest Mystery of Mathematics". Book by Marcus du Sautoy, 2003.
A great deal more is known than has been proved.