Combining Texts

You have chosen 'On the Concept of Number' by David Hilbert, 'A Mathematical Introduction to Logic (2nd)' by Herbert B. Enderton and 'A World of Dispositions' by J.H. Fetzer

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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