Combining Texts

You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'Science without Numbers' by Hartry Field and 'What is Property?' by Pierre-Joseph Proudhon

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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