Combining Texts

You have chosen 'New Scientist articles' by New Scientist writers, 'The Thesis that Mathematics is Logic' by Hilary Putnam and 'Elucidation of some points in E.Schrder' by Gottlob Frege

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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