Combining Texts

You have chosen 'New System and Explanation of New System' by Gottfried Leibniz, 'Letters to Descartes' by Elizabeth, Princess of Bohemia and 'Characteristics' by 3rd Earl of Shaftesbury

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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