Combining Texts

You have chosen 'Science and Method' by Henri Poincaré, 'Letters to Descartes' by Elizabeth, Princess of Bohemia and 'Axiomatic Theories of Truth (2005 ver)' by Volker Halbach

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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