Combining Texts

You have chosen 'Sapiens: brief history of humankind' by Yuval Noah Harari, 'Building Blocks of Mathematical Logic' by Moses Schnfinkel and 'Reflections on Knowledge, Truth and Ideas' 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