Combining Texts

You have chosen 'On the Happy Life' by Seneca the Younger, 'Identity in Substances and True Propositions' by Gottfried Leibniz and 'On Carnap's Views on Ontology' by Willard Quine

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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