Combining Texts

You have chosen 'Aristotle and Descartes on Matter' by Gottfried Leibniz, 'Letter to Frege 29.12.1899' by David Hilbert and 'Number Determiners, Numbers, Arithmetic' by Thomas Hofweber

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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