Combining Texts

You have chosen 'Parmenides' by Plato, 'On boundary numbers and domains of sets' by Ernst Zermelo and 'Which Logic is the Right Logic?' by Leslie H. Tharp

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All the ideas for Natural Theory, or select a subheading:
      A. Speculations on Nature
      B. Natural Kinds
      C. Causation
      D. Laws of Nature