Combining Texts

You have chosen 'A Pragmatic Conception of the A Priori' by C.I. Lewis, 'The Problem of Knowledge' by A.J. Ayer and 'Frege on Extensions from Concepts' by Tyler Burge

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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