Combining Texts

You have chosen 'Aristotle and Descartes on Matter' by Gottfried Leibniz, 'New system of communication of substances' by Gottfried Leibniz and 'Identity in Substances and True Propositions' by Gottfried Leibniz

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All the ideas for Formal Logic, or select a subheading:
      A. Syllogistic Logic
      B. Propositional Logic PL
      C. Predicate Calculus PC
      D. Modal Logic ML
      E. Nonclassical Logics
      F. Set Theory ST
      G. Formal Mereology