Combining Texts

You have chosen 'Logic and Epistemology of Causal Relations' by G.H. von Wright, 'An Axiomatization of Set Theory' by John von Neumann and 'Truthmakers' by Fraser MacBride

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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