Combining Texts

You have chosen 'Syntagma' by Pierre Gassendi, 'A Mathematical Introduction to Logic (2nd)' by Herbert B. Enderton and 'works' by Ren Descartes

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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