Combining Texts

You have chosen 'A Puzzle about Belief' by Saul A. Kripke, 'On the Basis of Morality' by Arthur Schopenhauer and 'Frege on Extensions from Concepts' by Tyler Burge

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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