Turing knelt by his armchair, his finger stabbing excitedly at the arcane symbols filling Gödel’s article. ‘Here: this genius proved — conclusively proved! — that no matter what axioms you accept, a theory of numbers will of necessity contain unprovable propositions!’ ‘You mean, of course, the false propositions?’ ‘No, I mean true propositions — true yet impossible to prove!’ Petros jumped to his feet. ‘This is not possible!’ ‘Oh yes it is, and the proof of it is right here, in these fifteen pages: “Truth is not always provable!”’ My uncle now felt a sudden dizziness overcome him. ‘But … but
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