Combining Texts

You have chosen 'works' by Luitzen E.J. Brouwer, 'The Aim and Structure of Physical Theory' by Pierre Duhem and 'Four Decades of Scientific Explanation' by Wesley Salmon

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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