Combining Texts

You have chosen 'Exigency to Exist in Essences' by Gottfried Leibniz, 'The Nature of Mathematical Knowledge' by Philip Kitcher and 'On Plural Reference and Set Theory' by Helen Cartwright

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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