Combining Texts

You have chosen 'Exigency to Exist in Essences' by Gottfried Leibniz, 'Carnap and Logical Truth' by Willard Quine and 'A New Kind of Science' by Stephen Wolfram

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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