Graph Lemma

Štěpán Holub and Štěpán Starosta

24 May 2021


Graph lemma quantifies the defect effect of a system of word equations. That is, it provides an upper bound on the rank of the system. We formalize the proof based on the decomposition of a solution into its free basis. A direct application is an alternative proof of the fact that two noncommuting words form a code.
BSD License

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