Combining Texts

You have chosen 'Gentzen's Analysis of First-Order Proofs' by Dag Prawitz, 'Causality and Properties' by Sydney Shoemaker and 'Idealism: a critical survey' by A.C. Ewing

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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