Combining Texts

You have chosen 'Frege on Knowing the Third Realm' by Tyler Burge, 'A Mathematical Introduction to Logic (2nd)' by Herbert B. Enderton and 'Are there propositions?' by Gilbert Ryle

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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