Combining Texts

You have chosen 'A Puzzle about Belief' by Saul A. Kripke, 'What is the Basis of Moral Obligation?' by H.A. Prichard and 'Letters to Leibniz 1' by Isaac Newton

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All the ideas for Mathematics, or select a subheading:
      A. Nature of Mathematics
      B. Foundations for Mathematics
      C. Sources of Mathematics