the class of unrestricted grammars (also called semi-Thue, type-0 or phrase structure grammars) is the most general class of grammars in the Chomsky...

but not by a context-free grammar. Context-sensitive grammars are less general (in the same sense) than unrestricted grammars. Thus, CSGs are positioned...

that every noncontracting grammar generates a context-sensitive language. There is a similar normal form for unrestricted grammars as well, which at least...

thus equivalent to Noam Chomsky's unrestricted grammars, which are sometimes called semi-Thue grammars. A formal grammar only differs from a semi-Thue system...

regular languages, respectively. Although much less powerful than unrestricted grammars (Type 0), which can in fact express any language that can be accepted...

security. The membership problem for leftist grammars is decidable. Unrestricted grammar String rewriting Motwani, Rajeev; Panigrahy, Rina; Saraswat, Vijay;...

limits of computing. The Turing machine is capable of processing an unrestricted grammar, which further implies that it is capable of robustly evaluating...

symbol S ∈ N {\displaystyle S\in N} that is the start symbol. In an unrestricted grammar, a production is of the form u → v {\displaystyle u\to v} , where...

In formal language theory, an LL grammar is a context-free grammar that can be parsed by an LL parser, which parses the input from Left to right, and...

relevant chapter with a quote from GEB. Invariant (mathematics) Unrestricted grammar Here, x and y are variables, standing for strings of symbols. A rule...