Combining Texts

You have chosen 'On Second-Order Logic' by George Boolos, 'On Concept and Object' by Gottlob Frege and 'Frege on Apriority' by Tyler Burge

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All the ideas for Theory of Logic, or select a subheading:
      A. Overview of Logic
      B. Logical Consequence
      C. Ontology of Logic
      D. Assumptions for Logic
      E. Structures of Logic
      F. Referring in Logic
      G. Quantification
      H. Proof Systems
      I. Semantics of Logic
      J. Model Theory in Logic
      K. Features of Logics
      L. Paradox