By Ian Chiswell

ISBN-10: 1848009402

ISBN-13: 9781848009400

According to the author’s lecture notes for an MSc path, this article combines formal language and automata thought and team concept, a thriving learn zone that has built largely over the past twenty-five years.

The goal of the 1st 3 chapters is to provide a rigorous evidence that a number of notions of recursively enumerable language are an identical. bankruptcy One starts off with languages outlined via Chomsky grammars and the assumption of desktop attractiveness, features a dialogue of Turing Machines, and contains paintings on finite country automata and the languages they understand. the next chapters then specialise in subject matters corresponding to recursive capabilities and predicates; recursively enumerable units of common numbers; and the group-theoretic connections of language conception, together with a quick creation to automated teams.

Highlights include:
* A accomplished examine of context-free languages and pushdown automata in bankruptcy 4, specifically a transparent and entire account of the relationship among LR(k) languages and deterministic context-free languages.
* A self-contained dialogue of the numerous Muller-Schupp consequence on context-free groups.

Enriched with specific definitions, transparent and succinct proofs and labored examples, the ebook is aimed essentially at postgraduate scholars in arithmetic yet may also be of significant curiosity to researchers in arithmetic and laptop technological know-how who are looking to study extra concerning the interaction among staff concept and formal languages.

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

Sample text

Then by an easy induction on n, f (n) ≥ n for all n ∈ N, so A is infinite. Further, a ∈ A if and only if ∃n ≤ a( f (n) = a). 4, so χA is recursive. Conversely, suppose A is recursive and infinite. Define ϕ : N → N by ϕ (x) = μ y(y > x ∧ χA (y) = 1) a partial recursive function since χA is recursive, and total since A is infinite. Hence ϕ is recursive by Cor. 17. Let Φ be the iterate of ϕ , and put f (n) = Φ (a0 , n), where a0 is the least element of A. Then f is recursive since Φ is, and f (N) ⊆ A since ϕ (N) ⊆ A.

Fr : Nn → N and g : Nr → N are abacus computable. By Cor. 13, there is an abacus machine M such that (x1 , . . , xn+1 , . ) ϕM = ( f1 (x1 , . . , xn ), . . , fr (x1 , . . , xn ), xn+1 , . ). Let g be computed by the abacus machine M , and choose m greater than the number of any register used by M. Then M Clearr+1 . Clearm M computes g ◦ ( f1 , . . , fr ). Thus the set of abacus computable functions is closed under composition. 2 Recursive Functions 37 Let f : Nn → Nn be such that its coordinate functions fi = πin ◦ f are abacus computable for 1 ≤ i ≤ n.

23 (Kleene Normal Form Theorem). There exist primitive recursive functions ϕ : N → N and ψ : N3 → N such that, if f : N → N is partial recursive, there exists g ∈ N such that f (x) = ϕ (μ t(ψ (g, x,t) = 0)). Proof. 20 and Cor. 22, there are primitive recursive functions F, G : N3 → N such that if f : N → N is partial recursive, there exists g ∈ N such that f (x) = F(g, x,t) for any t such that G(g, x,t) = 0 (and f (x) is undefined if no such t exists). Given f , choose such a number g. Now put ϕ = F ◦ J3−1 and ψ (s, x, y) = GJ3−1 (y) + |K(y) − s| + |KL(y) − x| where J3 , K and L are as in Exercises (3) and (4) at the end of this chapter.

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