By Ian Chiswell

ISBN-10: 1848009402

ISBN-13: 9781848009400

In line with the author’s lecture notes for an MSc direction, this article combines formal language and automata concept and staff idea, a thriving examine zone that has built broadly during the last twenty-five years.

The target of the 1st 3 chapters is to provide a rigorous evidence that a variety of notions of recursively enumerable language are similar. bankruptcy One starts with languages outlined by means of Chomsky grammars and the assumption of computer reputation, includes a dialogue of Turing Machines, and comprises paintings on finite kingdom automata and the languages they understand. the subsequent chapters then concentrate on subject matters equivalent to recursive services and predicates; recursively enumerable units of typical numbers; and the group-theoretic connections of language concept, together with a quick creation to automated teams.

Highlights include:

* A accomplished examine of context-free languages and pushdown automata in bankruptcy 4, particularly a transparent and whole account of the relationship among LR(k) languages and deterministic context-free languages.

* A self-contained dialogue of the numerous Muller-Schupp outcome on context-free groups.

Enriched with distinct definitions, transparent and succinct proofs and labored examples, the ebook is aimed basically at postgraduate scholars in arithmetic yet can also be of serious curiosity to researchers in arithmetic and machine technological know-how who are looking to research extra in regards to the interaction among workforce thought and formal languages.

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**Additional resources for A Course in Formal Languages, Automata and Groups (Universitext)**

**Sample text**

Hr by composition, and g, h1 , . . e. if f is obtained from g and h by primitive recursion, and g, h ∈ C, then f ∈ C). There is a smallest primitively recursively closed class (the intersection of all primitively recursively closed total classes), called the class of primitive recursive functions. Note. It is left to the reader to show that a function f is primitive recursive if and only if there is a sequence f0 , . . , fk = f of functions, where each fi is either an initial function, or is obtained by composition from some of the f j , for j < i, or is obtained by primitive recursion from two of the f j with j < i.

Note. It is left to the reader to show that a function f is primitive recursive if and only if there is a sequence f0 , . . , fk = f of functions, where each fi is either an initial function, or is obtained by composition from some of the f j , for j < i, or is obtained by primitive recursion from two of the f j with j < i. Such a sequence is called a primitive recursive definition of f . 24 2 Recursive Functions Examples of Primitive Recursive Functions. (1) (addition) The function s : N2 → N defined by s(x, y) = x + y is primitive recursive.

Hr (x1 , . . , xn )) where the left-hand side of the equation is defined if and only if the right-hand side is. If g, h1 , . . , hr are computable functions, one can see that f is computable by a simple generalisation of the discussion above. Definition. Let g : Nn → N, h : Nn+2 → N be partial functions. The function f : Nn+1 → N obtained from g and h by primitive recursion is defined by: 2 Recursive Functions 23 f (x1 , . . , xn , 0) = g(x1 , . . , xn ) f (x1 , . . , xn , y + 1) = h(x1 , .