Combining Texts

You have chosen 'What is the Basis of Moral Obligation?' by H.A. Prichard, 'The Universe as We Find It' by John Heil and 'The Foundations of Mathematics' by David Hilbert

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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