Chomsky hierarchy

Formal grammars come in a hierarchy of expressive power, first introduced by Noam Chomsky.

**Type-0 grammars**, also known as unrestricted grammars generate the recursively enumerable languages, they correspond to Turing machines.**Type-1 grammars**are also called context sensitive grammars?, they correspond to linear-bounded nondeterministic Turing machines.**Type-2 grammars**are also called context free grammars, they correspond to nondeterministic pushdown automata.**Type-3 grammars**generate regular languages, they are equivalent to regular expressions? and finite-state automata.

Created on November 21, 2020 at 19:38:58. See the history of this page for a list of all contributions to it.