Combining Texts

You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'Defining 'Intrinsic' (with Rae Langton)' by David Lewis and 'Metaphysical conseqs of principle of reason' by Gottfried Leibniz

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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