Abstract

The G -schemes are a class of structured flowchart schemes defined algebraically by Elgot in [1]. Bloom and Tindell [2] gave a graph theoretic characterization of the biaccessible G -schemes, i.e. those in which every vertex is on a path from begin to exit. We give here a graph theoretic characterization of the entire class of G -schemes, and also of a smaller and simpler class, the T L -schemes of [5].

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