Combining Texts

You have chosen 'Ways Worlds Could Be' by Peter Forrest, 'Completeness of Axioms of Logic' by Kurt Gdel and 'On boundary numbers and domains of sets' by Ernst Zermelo

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All the ideas for Objects, or select a subheading:
      A. Existence of Objects
      B. Unity of Objects
      C. Structure of Objects
      D. Essence of Objects
      E. Objects over Time
      F. Identity among Objects