Combining Texts

You have chosen 'From Stimulus to Science' by Willard Quine, 'The iterative conception of Set' by George Boolos and 'The Logical Structure of the World (Aufbau)' by Rudolph Carnap

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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