Combining Texts

You have chosen 'works' by George Cantor, 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz and 'Review of Chihara 'Struct. Accnt of Maths'' by John P. Burgess

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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