Template:Formal languages and grammars
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| Chomsky hierarchy |
Grammars | Languages | Minimal automaton |
|---|---|---|---|
| Type-0 | Unrestricted | Recursively enumerable | Turing machine |
| n/a | (no common name) | Recursive | Decider |
| Type-1 | Context-sensitive | Context-sensitive | Linear-bounded |
| n/a | Indexed | Indexed | Nested stack |
| n/a | Tree-adjoining etc. | (Mildly context-sensitive) | Embedded pushdown |
| Type-2 | Context-free | Context-free | Nondeterministic pushdown |
| n/a | Deterministic context-free | Deterministic context-free | Deterministic pushdown |
| Type-3 | Regular | Regular | Finite |
| n/a | Star-free | Counter-Free | |
| Each category of languages or grammars is a proper subset of the category directly above it, and any automaton in each category has an equivalent automaton in the category directly above it. |
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