Combining Texts

You have chosen 'The Evolution of Logic' by William D. Hart, 'Commentary on 'Physics'' by Averroes (Ibn Rushd) and 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz

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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