Recursively Enumerable Language
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In mathematics, logic and computer science, a recursively enumerable language is a type of formal language which is also called partially decidable or Turing-recognizable. It is known as a type-0 language in the Chomsky hierarchy of formal languages. The class of all recursively enumerable languages is called RE. There exist three equivalent major definitions for the concept of a recursively enumerable language. All regular, context-free, context-sensitive and…mehr

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In mathematics, logic and computer science, a recursively enumerable language is a type of formal language which is also called partially decidable or Turing-recognizable. It is known as a type-0 language in the Chomsky hierarchy of formal languages. The class of all recursively enumerable languages is called RE. There exist three equivalent major definitions for the concept of a recursively enumerable language. All regular, context-free, context-sensitive and recursive languages are recursively enumerable. Post''s theorem shows that RE, together with its complement co-RE, correspond to the first level of the arithmetical hierarchy.