Combining Texts

You have chosen 'Letters to Wolff' by Gottfried Leibniz, 'The Logic of What Might Have Been' by Nathan Salmon and 'Sets and Numbers' by Penelope Maddy

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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