Combining Texts

You have chosen 'The Trouble with Possible Worlds' by William Lycan, 'On Nature Itself (De Ipsa Natura)' by Gottfried Leibniz and 'Law, Pragmatism and Democracy' by Richard Posner

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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