Indexed language refers to a type of formal language used in theoretical computer science and linguistics, which is characterized by a level of complexity that is greater than context-free languages but less than recursively enumerable languages. Indexed languages are associated with indexed grammars, which provide a mechanism for generating strings that can include nested structures through the use of "indices." In more detail: 1. **Indexed Grammars**: These grammars extend context-free grammars by introducing indices to handle nested dependencies.
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