Combining Texts

You have chosen 'The Logic of Boundaryless Concepts' by Ian Rumfitt, 'Letter to G.H. Schaller' by Baruch de Spinoza 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