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On the irregularity of the duplication closure. (English) Zbl 0983.68111

Summary: We solve a problem proposed in “On the regularity of the duplication closure” by J. Dassow, V. Mitrana and Gh. Păun [ibid. 69, 133-136 (1999; Zbl 0941.68605)].

MSC:

68Q45 Formal languages and automata

Citations:

Zbl 0941.68605
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