Combining Texts

You have chosen 'Persistence, Change and Explanation' by Sally Haslanger, 'Scientific Explanation and the Causal Structure of the World' by Wesley Salmon and 'Letter to Frege 29.12.1899' by David Hilbert

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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