Combining Texts

You have chosen 'The Value of Science' by Henri Poincaré, 'Boole calculus and the Concept script' by Gottlob Frege and 'What We Owe to Each Other' by Thomas M. Scanlon

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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