Combining Texts

You have chosen 'Preface to 'Principles of Philosophy'' by René Descartes, 'Letters to Burcher De Volder' by Gottfried Leibniz and 'On the Algebra of Logic' by Charles Sanders Peirce

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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