Combining Texts

You have chosen 'What is Art?' by Leo Tolstoy, 'Intro to 'Provenance of Pure Reason'' by William W. Tait and 'Presidential Address of Am. Math. Soc' by Oswald Veblen

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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