Combining Texts

You have chosen 'Letter to Shumacher' by Carl Friedrich Gauss, 'What is an Idea?' by Gottfried Leibniz and 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz

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All the ideas for Science, or select a subheading:
      A. Basis of Science
      B. Scientific Theories
      C. Induction
      D. Explanation