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Kurt Gödel first formally described in his "Incompleteness Theorem" one of the greatest truths in history, which is that in a closed system it is not possible to know all that is true (or at least to be able to prove all that is true). There must be at least one fundamental that cannot be proven, but must be true. Gödel's "Incompleteness Theorem" is a key achievement historical achievement in Mathematics, and set the stage for Gödel's pioneering work on the mathematics of logic, which would o...