Combining Texts

You have chosen 'Dialogue on human freedom and origin of evil' by Gottfried Leibniz, 'Reply to Fourth Objections' by Ren Descartes and 'Letters to Varignon' 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