Combining Texts

You have chosen 'Proof of an External World' by G.E. Moore, 'On the Foundations of Logic and Arithmetic' by David Hilbert and 'Understanding the Infinite' by Shaughan Lavine

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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