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Broken Triangles: From Value Merging to a Tractable Class of General-Arity Constraint Satisfaction Problems

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Academic year: 2021

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Figure

Fig. 1. A broken triangle on two values a , b for a given variable x.
Fig. 2. (a) A broken triangle (shown in bold) exists on values a ′ , b ′ at variable z
Fig. 6. (a) A broken triangle (shown in bold) exists on values a, b at variable x. (b) After removing value d from D( z ) by AC, this broken triangle has disappeared.
Fig. 7. (a) Representation of the variable X i and its negation (by the possibility of performing a merge in D( x i j ) or D( y i j ) , respectively, according to rules (1), (2))
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