Chomsky hierarchy
Chomsky hierarchy A series of four classes of formal languages whose definition in 1959 by Noam Chomsky marked the beginning of formal language theory, and that have ever since remained central to the subject. In increasing complexity they are called type 3, type 2, type 1, and type 0, each one a subclass of the next. Each type can be defined either by a class of grammars or by a class of automata, as indicated in the table. Type 0 consists of all recursively enumerable languages. Type 1 is a subclass of the languages recognizable by primitive recursive functions. Languages in types 2 and 3 can be recognized by a Turing machine in cubic and linear time, respectively.
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Monotype , Monotype •gripe, hype, mistype, pipe, ripe, sipe, slype, snipe, stripe, swipe, tripe, type, wipe •guttersnipe • bagpipe • standpipe •tailpipe • drain… Type , type / tīp/ • n. 1. a category of people or things having common characteristics: this type of heather grows better in a drier habitat blood types. ∎… Gilbert-type Delta , Skip to main content
Gilbert-type delta Type Specimen , Skip to main content
type specimen mating type , mating type The equivalent in lower organisms (especially micro-organisms) of sexes in higher organisms. Microorganisms may be subdivided into mating… subtype , subtype A relationship between data types. Type T1 is a subtype of type T2 if the set of all possible values of T1 is a subset of the set of all poss…
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Chomsky hierarchy