Combining Texts

You have chosen 'teaching' by Pythagoras, 'Can Mechanisms Replace Laws of Nature?' by Bert Leuridan and 'Investigations in the Foundations of Set Theory I' by Ernst Zermelo

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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