Combining Texts

You have chosen 'Axiomatic Theories of Truth (2005 ver)' by Volker Halbach, 'What We Owe to Each Other' by Thomas M. Scanlon and 'Paradoxes of the Infinite' by Bernard Bolzano

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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