… only one grammar is active - it rewrites the current sentential form. The matters such as which component grammar can become active at a given moment, and when an active grammar …
CITATION STYLE
Dassow, J., Păun, G., & Rozenberg, G. (1997). Grammar Systems. In Handbook of Formal Languages (pp. 155–213). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-662-07675-0_4
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