Combining Texts

You have chosen 'What Numbers Are' by Nicholas P. White, 'The Right and the Good' by W. David Ross and 'Introduction to Mathematical Logic' by Michal Walicki

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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