Commuting upper triangular binary morphismsArticle
Authors: Juha Honkala
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Juha Honkala
A morphism $g$ from the free monoid $X^*$ into itself is called upper triangular if the matrix of $g$ is upper triangular. We characterize all upper triangular binary morphisms $g_1$ and $g_2$ such that $g_1g_2=g_2g_1$.
Comment: 14 pages
Volume: Volume 191, Issues 3-4: Iiro Honkala's 60 Birthday
Published on: November 10, 2024
Accepted on: September 28, 2023
Submitted on: February 14, 2023
Keywords: Computer Science - Formal Languages and Automata Theory, F.4.3