Template:Formal languages and grammars

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v • d • e Automata theory: formal languages and formal grammars 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 n/a Star-free Aperiodic finite 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.