Combining Texts

You have chosen 'Changes in Events and Changes in Things' by Arthur N. Prior, 'Reply to First Objections' by Ren Descartes and 'Identity, Essence and Indiscernibility' by Stephen Yablo

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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