Combining Texts

You have chosen 'Counterpart theory and Quant. Modal Logic' by David Lewis, 'The Sentiment of Rationality' by William James and 'On the Conservation of Force' by Hermann von Helmholtz

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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