Combining Texts

You have chosen 'De Mundo (On the World)' by Thomas Hobbes, 'Nominalism and Realism' by David M. Armstrong and 'Building Blocks of Mathematical Logic' by Moses Schnfinkel

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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