He was a pioneer of operator-precedence grammars, and is credited with initiating the field of Ph . D.
2.
The class of languages described by operator-precedence grammars, i . e ., operator-precedence languages, is strictly contained in the class of deterministic context-free languages, and strictly contains visibly pushdown languages.
3.
The Weber relationship between a pair of symbols ( V _ t \ cup V _ n ) is necessary to determine if a formal grammar is a simple precedence grammar, and in such case the simple precedence parser can be used.
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