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This paper deals with logics of programs. The objective is to formalize a notion of program description, and to give both plausible (semantic) and effective (syntactic) criteria for the notion of truth of a description. A novel feature of this treatment is the development of the mathematics underlying Floyd-Hoare axiom systems independently of such systems. Other directions that such research might...
Motivated by an elementary programming system for formal language generation, we propose a generalized a pushdown acceptor which uses both a checking stack and a pushdown store in original manner. In the analysis of the machine-model parallel rewriting appears to be a fundamental tool for breaking the implicit recursion-structure. Variations of the machine-model (in the sense of Cook) lead to a natural...
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