Abstract
In a recent manuscript—in the literal sense of the word—: “Some properties of the relative converse” (March 1995), Tony Hoare plays with tetrahedra of which the edges may be directed. (As by-product of his considerations he finds, for instance, that “any non-cyclic ascription of directions to any five of the edges can be non-cyclically extended to the sixth edge.”) Here is a little bit of related theory.
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© 1997 Springer-Verlag Berlin Heidelberg
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Dijkstra, E.W. (1997). Complete DAGs (EWD1204). In: Broy, M., Schieder, B. (eds) Mathematical Methods in Program Development. NATO ASI Series, vol 158. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-60858-2_4
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DOI: https://doi.org/10.1007/978-3-642-60858-2_4
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