Combining Texts

You have chosen 'Two Problems of Epistemology' by Karl Popper, 'On the General Idea of Proof Theory' by Dag Prawitz and 'Stipulation, Meaning and Apriority' by Paul Horwich

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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