Regulation by Valences
نویسندگان
چکیده
Valences are a very simple and yet powerful method of regulated rewriting. In this paper we give an overview on di erent aspects of this subject. We discuss closure properties of valence languages. It is shown that matrix grammars can be simulated by valence grammars over nite monoids. A Chomsky normal form theorem is proved for multiplicative valence grammars, thereby solving the open question of the existence of normal forms for unordered vector grammars. This also gives an alternative proof of the inclusion of context-free unordered vector languages in LOG(CFL). Moreover, we investigate valences in parallel systems, thereby solving part of open problems posted in [5, p. 267]. Remark: A short version of this paper appeared in the proceedings of the 22nd MFCS conference 1997, see [6]. Regulation by Valences 1
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