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θ-subsumption
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θ -subsumes is the simplest model of deduction for ILP which regards clauses as sets of (positive and negative) literals
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A clause c 1 θ -subsumes a clause c 2 if and only if there exists a substitution θ such that c 1 θ ⊆ c 2
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c 1 is called a generalisation of c 2 (and c 2 a specialisation of c 1 ) under θ subsumption
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θ -subsumes The θ subsumption inductive inference rule is: