Combining Texts

You have chosen 'An Argument for the Identity Theory' by David Lewis, 'Identity through Possible Worlds' by Roderick Chisholm and 'The Big Book of Concepts' by Gregory L. Murphy

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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