A Note on Scattered Context Grammars

Download or read book A Note on Scattered Context Grammars written by David L. Milgram and published by . This book was released on 1971 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scattered context grammars can be regarded as web grammars in which the web is the transitive closure of string. It is an open question whether such grammars are strictly weaker than context-sensitive grammars. The report shows that if 'negative context' is allowed, they are as strong as context-sensitive grammars. Negative context alone appears to be comparable in power to (positive) scattered context, but it has not yet been shown that negative context grammars are strictly weaker than context-sensitive grammars. Unordered (positive or negative) scattered context is apparently even weaker, though still stronger than context-free; in web grammar terms, it corresponds to using the complete (undirected) web. (Author).