By Jürgen Giesl, Thomas Ströder (auth.), Elvira Albert (eds.)

This ebook constitutes the completely refereed post-conference court cases of the twenty second foreign Symposium on Logic-Based software Synthesis and Transformation, LOPSTR 2012, held in Leuven, Belgium in September 2012.

The thirteen revised complete papers offered including 2 invited talks have been conscientiously reviewed and chosen from 27 submissions. one of the issues lined are specification, synthesis, verification, research, optimization, specialization, safeguard, certification, functions and instruments, program/model manipulation, and transformation suggestions for any programming language paradigm.

**Read Online or Download Logic-Based Program Synthesis and Transformation: 22nd International Symposium, LOPSTR 2012, Leuven, Belgium, September 18-20, 2012, Revised Selected Papers PDF**

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**Extra resources for Logic-Based Program Synthesis and Transformation: 22nd International Symposium, LOPSTR 2012, Leuven, Belgium, September 18-20, 2012, Revised Selected Papers**

**Example text**

Tn ∈ T , and B1 , . . , Bs (s ≥ 0), the body of the clause (denoted bd(C)), is a conjunction of atoms, also called a goal. A predicate is deﬁned by a sequence of clauses whose heads share the same predicate symbol and arity. Finally, a program is formed Semantic Code Clones in Logic Programs 37 by a set of predicate deﬁnitions. To ease the notation, we will use the following auxiliary notations and functions. A sequence of objects o1 , . . , on will sometimes simply be represented by o (for example, a predicate is typically denoted C).

Condition (13) of Def. 1 ensures that the resulting set of equations with variable-free righthand sides is unique. We can thus deﬁne: Deﬁnition 4. Let [[−]] be a program semantics, S a BANscript which is wellbehaved for a query Q and Φ0 a URL substitution, and let Φ be the solution to Eq(Q, S)∪Φ0 . The answer to Q (with respect to S, [[−]] and Φ0 ) is the restriction of Φ to Q; the substitution Φ is referred to as the full answer to Q. The query is failed whenever the solution assigns ⊥ to any variable in Q.

LOPSTR 2012, LNCS 7844, pp. 35–50, 2013. © Springer-Verlag Berlin Heidelberg 2013 36 add add add add C. Dandois and W. Vanhoof ij(L, I, 0, 0) ij([], I, J, 0) ij([A|As], 1, J, S) ij([A|As], I, J, S) ← ←J >0 ← J > 0, J1 is J-1, add ij(As, 1, J1 , S1 ), S is A+S1 ← I > 1, J ≥ I, I1 is I-1, J1 is J-1, add ij(As, I1 , J1 , S) The predicate prev is simply deﬁned as prev(N1 , N ) ← N1 is N -1. An atom of the form take mult n(N, L1 , L2 , P ) succeeds if the list L2 contains the N ﬁrst naturals of the list L1 and if P is the product of those naturals.