Combining Texts

You have chosen 'What is the Source of Knowledge of Modal Truths?' by E.J. Lowe, 'Letters to Mersenne' by Ren Descartes and 'On the Law of War and Peace' by Hugo Grotius

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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