Titlebook: Computer Science Logic; 10th International W Dirk Dalen,Marc Bezem Conference proceedings 1997 Springer-Verlag Berlin Heidelberg 1997 Compu

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Dow P. Hurst,Patricia H. Reggioodels of SDT and show that the domains in them yield models of ADT. On the other hand, for each model of ADT in a wide class we construct a model of SDT such that the domains in it provide a model of ADT which conservatively extends the original model.

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A. S. Lewis,R. Heroux,F. Nolte,P. Robinson We obtain our result by giving a winning strategy for the duplicator in the Ajtai-Fagin Ehrenfeucht-Fraïssé Game. The result can be strengthened to obtain nondefinability for a larger class of graphs.

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https://doi.org/10.1007/978-1-4615-2802-9uctors is associated to each term of the system whose unification gives the possible typings. We define a syntactic restriction on constructors which is enough to capture all the typability problems: the elementary calculus. We use these principal typed terms to prove that the higher order typings hierarchy collapse at the second level.

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https://doi.org/10.1007/978-1-4615-2802-9 more general definability theory of optimization problems. We define a class . φ and show that every problem in this class has a . (FPTAS), i.e., can be approximated to every desired accuracy . in time polynomial in the size of the input and 1/.. An example for a problem in . φ is ..