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Some remarks on invertible substitutions on three letter alphabet |
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| Authors: | Zhixiong Wen Yiping Zhang |
| Affiliation: | (1) Department of Mathematics, State Key Laboratory of Software Engineer, Wuhan University, 430072 Wuhan, China |
| Abstract: | By introducing the notion of “prime substitution” it is shown that the set of invertible substitutions over an alphabet of more than three letters is not finitely generated. Some examples are given. |
| Keywords: | invertible substitution prime substitution |
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