The Chomsky Hierarchy: A Language Hierarchy
Introduction
The Chomsky hierarchy, also known as the Chomsky-Schützenberger hierarchy, is a hierarchy of formal languages classified by their generative power. It was introduced by Noam Chomsky in his 1956 paper "Three models for the description of language".
Chomsky Hierarchy Levels
The Chomsky hierarchy consists of four levels:
- Type 0: Unrestricted grammars
- Type 1: Context-sensitive grammars
- Type 2: Context-free grammars
- Type 3: Regular grammars
Each level of the hierarchy has a different set of rules for generating languages.
Conclusion
The Chomsky hierarchy is a fundamental theoretical framework in computer science and linguistics. It provides a way to classify formal languages based on their generative power, and has been used as a basis for many different types of language processing applications.
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