Combining Texts

You have chosen 'Letters to Hugo Boxel' by Baruch de Spinoza, 'Reply to 'Rorarius' 2nd ed' by Gottfried Leibniz and 'The Source of Necessity' by Bob Hale

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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