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Hypergraph languages of bounded degree. (English) Zbl 0802.68073
Summary: Two types of hypergraph rewriting grammar are considered: the well-known context-free hypergraph grammar (or CFHG grammar, also known as hyperedge replacement system or HR system) and the more recent separated handle hypergraph grammar (or S-HH grammar). It is shown that every S-HH hypergraph language of bounded (hyper-)degree can be generated by a (separated) CFHG grammar. This implies that these two types of grammar generate the same class of graph languages of bounded degree, but incomparable classes of hypergraph languages.

MSC:
68Q42 Grammars and rewriting systems
68Q45 Formal languages and automata
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