Combining Texts

You have chosen 'Presidential Address of Am. Math. Soc' by Oswald Veblen, 'The Nature of Thought' by Brand Blanshard and 'Can Mechanisms Replace Laws of Nature?' by Bert Leuridan

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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