Combining Texts

You have chosen 'Two Problems of Epistemology' by Karl Popper, 'An Inquiry into Meaning and Truth' by Bertrand Russell and 'The Thesis that Mathematics is Logic' by Hilary Putnam

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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