Combining Texts

You have chosen 'Sets and Numbers' by Penelope Maddy, 'On the Introduction of Transfinite Numbers' by John von Neumann and 'Reflections on my Critics' by Thomas S. Kuhn

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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