Combining Texts

You have chosen 'Many, but almost one' by David Lewis, 'Letters to Antoine Arnauld' by Ren Descartes and 'Elucidation of some points in E.Schrder' by Gottlob Frege

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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