Combining Texts

You have chosen 'Letters to Schlick' by Rudolph Carnap, 'Letter to Frege 29.12.1899' by David Hilbert and 'Theories of Everything' by Frank Close

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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