Combining Texts

You have chosen 'Thinking About Mathematics' by Stewart Shapiro, 'Remarks on the forces of inorganic Nature' by J.R. Mayer and 'In Defence of Pure Reason' by Laurence Bonjour

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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