Computer Science Logic: 22nd International Workshop, CSL by Frédéric Blanqui, Jean-Pierre Jouannaud, Albert Rubio

By Frédéric Blanqui, Jean-Pierre Jouannaud, Albert Rubio (auth.), Michael Kaminski, Simone Martini (eds.)

This booklet constitutes the refereed lawsuits of the twenty second overseas Workshop on laptop technological know-how common sense, CSL 2008, held because the seventeenth Annual convention of the EACSL in Bertinoro, Italy, in September 2008.

The 31 revised complete papers awarded including four invited lectures have been conscientiously reviewed and chosen from 102 submissions. All present facets of common sense in computing device technology are addressed, starting from foundational and methodological matters to software problems with useful relevance. The booklet concludes with a presentation of this year's Ackermann award.

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Extra info for Computer Science Logic: 22nd International Workshop, CSL 2008, 17th Annual Conference of the EACSL, Bertinoro, Italy, September 16-19, 2008. Proceedings

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The structure U (G) is a tree whose vertices are the finite paths π = v0 a1 v1 . . am vm in G where (vi , vi+1 ) ∈ Eai+1 , and the pair (π, (πam+1 vm+1 )) belongs then to the edge relation Eam+1 of U (G). A fundamental result of Muchnik (announced in [16]) says that MTh(U (G)) is decidable if MTh(G) is. Proofs are given in [7,9,18] and the expository paper [1]. Caucal observed in [5] that a large class of infinite graphs arises if MSOinterpretation and unfolding are applied in alternation. The Caucal hierarchy is a sequence C0 , C1 , .

Am vm in G where (vi , vi+1 ) ∈ Eai+1 , and the pair (π, (πam+1 vm+1 )) belongs then to the edge relation Eam+1 of U (G). A fundamental result of Muchnik (announced in [16]) says that MTh(U (G)) is decidable if MTh(G) is. Proofs are given in [7,9,18] and the expository paper [1]. Caucal observed in [5] that a large class of infinite graphs arises if MSOinterpretation and unfolding are applied in alternation. The Caucal hierarchy is a sequence C0 , C1 , . . of classes of graphs where – C0 consists of the finite graphs, – Cn+1 consists of the graphs obtained from the graphs in Cn by an unfolding and a subsequent MSO-interpretation.

A configuration of the pushdown transducer T is a tuple (w1 qw2 , {si }ni=1 , w ) where w1 , w2 , w ∈ Π ∗ , q ∈ Q and si ∈ Γ ∗ for each i ∈ [1, n]. Such a configuration means that the input head is positioned just after w1 on the input tape that has w1 w2 written on it, q is the current state, si is the current content of the i’th stack, and w is the output written thus far onto the output tape (with the head positioned at the end of w ). Transitions between configurations are defined by moves in δ as follows: (q,q ,a,b,j,γ,γ ) (w1 qaw2 , {si }ni=1 , w ) −−−−−−−−−−→ (w1 aq w2 , {si }ni=1 , w b), An Infinite Automaton Characterization of Double Exponential Time 37 where (q, q , a, b, j, γ, γ ) ∈ δ, if j = 0 then sj = sγ and sj = sγ , and si = si for each i = j.

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