Combining Texts

You have chosen 'The Value of Science' by Henri Poincaré, 'The Elements of Law' by Thomas Hobbes and 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz

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All the ideas for Thought, or select a subheading:
      A. Modes of Thought
      B. Mechanics of Thought
      C. Content
      D. Concepts
      E. Abstraction