Combining Texts

You have chosen 'Science and Method' by Henri Poincaré, 'Presidential Address of Am. Math. Soc' by Oswald Veblen and 'A General Principle to Explain Laws of Nature' by Gottfried Leibniz

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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