Combining Texts

You have chosen 'Whitehead and the Rise of Modern Logic' by Willard Quine, 'On the General Idea of Proof Theory' by Dag Prawitz and 'Defining 'Intrinsic' (with Rae Langton)' by David Lewis

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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