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This result was first proved in [ On the number of variables required in proofs , above ] using the machinery of algebraic logic developed in several research monographs and papers . The result is perfect dispassion , a mandate to execute fifty-six people . This result was first proved in 2000 by G.Lafferriere , G.J.Pappas and S.Sastry . This seemingly counter-intuitive result was first proved by Bohr in his Copenhagen thesis in 1911 , and given a thorough going over in the guise of what van Vleck called , in a more gentlmanly time , Miss van Leeuwen ’ s theorem .