language that is not recursively enumerable

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• Recursively enumerable set — In computability theory, traditionally called recursion theory, a set S of natural numbers is called recursively enumerable, computably enumerable, semidecidable, provable or Turing recognizable if: There is an algorithm such that the set of… …   Wikipedia

• Recursively enumerable language — In mathematics, logic and computer science, a recursively enumerable language is a type of formal language which is also called partially decidable or Turing acceptable. It is known as a type 0 language in the Chomsky hierarchy of formal… …   Wikipedia

• Language identification in the limit — is a formal model for inductive inference. It was introduced by E. Mark Gold in his paper with the same title [http://www.isrl.uiuc.edu/ amag/langev/paper/gold67limit.html] . In this model, a learner is provided with presentation of some language …   Wikipedia

• Context-sensitive language — In theoretical computer science, a context sensitive language is a formal language that can be defined by a context sensitive grammar. That is one of the four types of grammars in the Chomsky hierarchy. Of the four, this is the least often used,… …   Wikipedia

• Recursive language — This article is about a class of formal languages as they are studied in mathematics and theoretical computer science. For computer languages that allow a function to call itself recursively, see Recursion (computer science). In mathematics,… …   Wikipedia

• Machine that always halts — In computability theory, a machine that always halts also called a decider (Sipser, 1996) or a total Turing machine (Kozen, 1997) is a Turing machine that halts for every input. Because it always halts, the machine is able to decide whether a… …   Wikipedia

• Context-free language — In formal language theory, a context free language is a language generated by some context free grammar. The set of all context free languages is identical to the set of languages accepted by pushdown automata. Contents 1 Examples 2 Closure… …   Wikipedia

• Mildly context-sensitive language — In formal grammar theory, mildly context sensitive languages are a class of formal languages which can be efficiently parsed, but still possess enough context sensitivity to allow the parsing of natural languages. The concept was first introduced …   Wikipedia

• Deterministic context-free language — A deterministic context free language is a formal language which is defined by a deterministic context free grammar.[1] The set of deterministic context free languages is called DCFL[2] and is identical to the set of languages accepted by a… …   Wikipedia

• Computability theory — For the concept of computability, see Computability. Computability theory, also called recursion theory, is a branch of mathematical logic that originated in the 1930s with the study of computable functions and Turing degrees. The field has grown …   Wikipedia

• Recursion theory — Recursion theory, also called computability theory, is a branch of mathematical logic that originated in the 1930s with the study of computable functions and Turing degrees. The field has grown to include the study of generalized computability… …   Wikipedia