Combining Texts

You have chosen 'The Theory of Communicative Action' by Jürgen Habermas, 'A Mathematical Introduction to Logic (2nd)' by Herbert B. Enderton and 'Frege Philosophy of Language (2nd ed)' by Michael Dummett

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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