Combining Texts

You have chosen 'works' by Augustus De Morgan, 'On the Nature of Truth and Falsehood' by Bertrand Russell and 'Exigency to Exist in Essences' by Gottfried Leibniz

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