Besides the variants of the splicing operation discussed in the previous chapters (especially in Chap. 8) and of the generative mechanisms based on them, several others were already investigated in the literature, mainly from a mathematical point of view, without directing the research toward (universal) computability models. In this chapter we present some of these variants, as a challenge to the reader for building further computability models.
KeywordsGrowth Function Regular Language Replication System Bibliographical Note Chomsky Hierarchy
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