Combining Texts

You have chosen 'Two Problems of Epistemology' by Karl Popper, 'From an Ontological Point of View' by John Heil and 'Investigations in the Foundations of Set Theory I' by Ernst Zermelo

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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