By Taolue Chen, Wan Fokkink, Sumit Nain (auth.), Luca Aceto, Anna Ingólfsdóttir (eds.)

This publication constitutes the refereed complaints of the ninth foreign convention on Foundations of software program technological know-how and Computation buildings, FOSSACS 2006, held in Vienna, Austria in March 2006 as a part of ETAPS.

The 28 revised complete papers offered including 1 invited paper have been rigorously reviewed and chosen from 107 submissions. The papers are prepared in topical sections on cellular techniques, software program technological know-how, allotted computation, express types, actual time and hybrid platforms, procedure calculi, automata and common sense, domain names, lambda calculus, varieties, and security.

**Read or Download Foundations of Software Science and Computation Structures: 9th International Conference, FOSSACS 2006, Held as Part of the Joint European Conferences on Theory and Practice of Software, ETAPS 2006, Vienna, Austria, March 25-31, 2006. Proceedings PDF**

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**Example text**

The work required to show that nβ is sound with respect to nD is similar to earlier up-to β-moves work discussed in Section 4: we have to show that βmove conﬂuence (similar to Lemma 1) is also preserved for the new action fail; we also have to show that after a β-move, the redex and reduct conﬁgurations are counting-bisimilar (similar to Proposition 1). Finally we prove the following proposition Proposition 4 (Inclusion of fault tolerant simulation up-to β-moves). If Γ1 M1 nβ Γ2 M2 then Γ1 M1 nD Γ2 M2 Proof.

Lemma 1 (Conﬂuence of β-moves). −→β observes the diamond property: Γ N µ Γ τ / Γ M implies Γ N µ N τ β Γ M Γ /Γ M β µ N τ +3 ≡ Γ β f M or µ = τ and Γ M = Γ N A Theory for Observational Fault Tolerance 27 Table 7. β-Equivalence Rules for Typed DπLoc Γ |= N|M Γ |= (N|M)|M Γ |= N|l[[0]] Γ |= (ν n : T)(N|M) Γ |= (ν n : T)(ν m : U)N Γ |= (ν n : T)N Γ |= l[[P]] (bs-comm) (bs-assoc) (bs-unit) (bs-extr) (bs-flip) (bs-inact) (bs-dead) ≡f ≡f ≡f ≡f ≡f ≡f ≡f M|N N|(M|M ) N N|(ν n : T)M (ν m : U)(ν n : T)N N l[[Q]] n fn(N) n fn(N) Γ l : alive Proof.

This is outlined in Section 2, where we also formally deﬁne the language we use, DπLoc, give its reduction semantics, and also outline the behavioural equivalence ∼ =; this last is simply an instance of reduction barbed congruence, [6], modiﬁed so that observations can only be made at public locations. In Section 3 we give our formal deﬁnition of faulttolerance; actually we give two versions of (1) above, called static and dynamic fault tolerance; we also motivate the diﬀerence with examples. Proof techniques for establishing fault tolerance are given in Section 4; in particular we give a complete co-induction characterisation of ∼ =, using labelled actions, and some useful up-to techniques for presenting witness bisimulations.