Abstract
Let [enum], [exp-i] and [pr-i] denote the class of recursively enumerable, typ-i expression and typ-i programmed graph languages respectively. The following hierarchy is known from [5]:
[enum] = [exp-unrestricted] ⫌ [exp-monotone] = [exp-context free]
The proof of section 3 holds true also for unrestricted productions, so
[enum] = [exp-unrestricted] ⫅ [pr-unrestricted].
At the other hand, from Def. 2.11 it follows immediately that
[pr-unrestricted] ⫅ [enum].
Summarizing these results including the theorems of section 3, 4 and 5 we get the Corollary 6.1 : The following diagram of relations holds true:
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References
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Bunke, H. (1979). Programmed graph grammars. In: Claus, V., Ehrig, H., Rozenberg, G. (eds) Graph-Grammars and Their Application to Computer Science and Biology. Graph Grammars 1978. Lecture Notes in Computer Science, vol 73. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0025718
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DOI: https://doi.org/10.1007/BFb0025718
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