On Vertical Grammatical Restrictions that Produce an Infinite Language Hierarchy
نویسندگان
چکیده
This paper introduces deriuation table.s that represent a complete grammatical derivations as whole in a vertical way. These tables are obtained by writing the consecutive sentential forms of grammatical derivations vertically one by one. The present paper places and discusses some restrictions on the columns of these tables. IVIore specifically, these restrictions constrain the order of context-sensitive derivations on boundaries of columns. It is demonstrated, that grammars restricted in this way generate an infinite language hierarchy.
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تاریخ انتشار 2007