Combining Texts

You have chosen 'The Nature of Thought' by Brand Blanshard, 'Defining 'Intrinsic' (with Rae Langton)' by David Lewis and 'A Mathematical Introduction to Logic (2nd)' by Herbert B. Enderton

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All the ideas for Existence, or select a subheading:
      A. Nature of Existence
      B. Change in Existence
      C. Structure of Existence
      D. Theories of Reality
      E. Categories