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  1. A simple solution to Friedman's fourth problem.Xavier Caicedo - 1986 - Journal of Symbolic Logic 51 (3):778-784.
    It is shown that Friedman's problem, whether there exists a proper extension of first order logic satisfying the compactness and interpolation theorems, has extremely simple positive solutions if one considers extensions by generalized (finitary) propositional connectives. This does not solve, however, the problem of whether such extensions exist which are also closed under relativization of formulas.
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  • Positive results in abstract model theory: a theory of compact logics.J. A. Makowsky & S. Shelah - 1983 - Annals of Pure and Applied Logic 25 (3):263-299.
    We prove that compactness is equivalent to the amalgamation property, provided the occurrence number of the logic is smaller than the first uncountable measurable cardinal. We also relate compactness to the existence of certain regular ultrafilters related to the logic and develop a general theory of compactness and its consequences. We also prove some combinatorial results of independent interest.
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