Combining Texts

You have chosen 'How the Laws of Physics Lie' by Nancy Cartwright, 'Aristotle and Descartes on Matter' by Gottfried Leibniz and 'New System and Explanation of New System' by Gottfried Leibniz

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All the ideas for Existence, or select a subheading:
      A. Nature of Existence
      B. Change in Existence
      C. Structure of Existence
      D. Theories of Reality
      E. Categories