In this final chapter we shall take up several points of logic about which we have been silent in previous chapters. The notions of axiom and proof need clarification, and we need to say more about the notion of set, which was left extremely vague in Part I. We shall discuss these points first at an informal practical level in sections 39.1 and 39.2 and then conclude with a more formal approach, still far from that of a professional logician, but one which we hope may arouse the reader’s interest in reading the specialized texts.
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