Combining Texts

You have chosen 'Defining 'Intrinsic' (with Rae Langton)' by David Lewis, 'Inference to the Best Explanation (2nd)' by Peter Lipton and 'Against the Mathematicians' by Sextus Empiricus

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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