Combining Texts

You have chosen 'Axiomatic Theories of Truth (2005 ver)' by Volker Halbach, 'Completeness of Axioms of Logic' by Kurt Gdel and 'Aspects of Scientific Explanation' by Carl Hempel

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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