Combining Texts

You have chosen 'Two Problems of Epistemology' by Karl Popper, 'Logic and Epistemology of Causal Relations' by G.H. von Wright 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