Combining Texts

You have chosen 'The Courtier and the Heretic' by Matthew Stewart, 'Rules for the Direction of the Mind' by Ren Descartes and 'Exigency to Exist in Essences' 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