Combining Texts

You have chosen 'Two Problems of Epistemology' by Karl Popper, 'Mathematics and Indispensibility' by Elliott Sober and 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz

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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