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PDF-knownaboutthesizeofthesmallestnitemodelsofasatis-ableguardedsentence

PDF-knownaboutthesizeofthesmallestnitemodelsofasatis-ableguardedsentence

x8 y x y9 z x zwhere x yand x zareconjunctionsofatomsoverRcalledthebodyandtheheadofrespectivelyItiswellknownthatdatabasequeryansweringunderTGDsisundecidablesee17evenforve

x8 y( x; y)!9 z ( x; z) where( x; y)and ( x; z)areconjunctionsofatomsoverR calledthebodyandtheheadof respectively.Itiswell-knownthatdatabasequery-answeringunderTGDsisundecidable see[17] evenforve

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