Combining Texts

You have chosen 'A Realistic Theory of Categories' by Roderick Chisholm, 'Set Theory and its Logic' by Willard Quine and 'Letters to Antoine Arnauld' by Ren Descartes

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