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Diamond Subgraphs in the Reduction Graph of a One-Rule String Rewriting System

Adinayev Arthur, Stein Itamar

Fundamenta Informaticae

2021

Vol. 178, nr 3

173--185

In this paper, we study a certain case of a subgraph isomorphism problem. We consider the Hasse diagram of the lattice Mk (the unique lattice with k + 2 elements and one anti-chain of length k ) and find the maximal k for which it is isomorphic to a subgraph of the reduction graph of a given one-rule string rewriting system. We obtain a complete characterization for this problem and show that there is a dichotomy. There are one-rule string rewriting systems for which the maximal such k is 2 and there are cases where there is no maximum. No other intermediate option is possible.