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KB Term:  Term intersection
English Word: 

Sigma KEE - Necessity
Necessity

appearance as argument number 1
-------------------------


(documentation Necessity ChineseLanguage "这是指应用于必须出现 Proposition 的属性,即是 它在所有的世界上都会实现。") chinese_format.kif 3891-3892
(documentation Necessity EnglishLanguage "Attribute that applies to Propositions that are necessary, i.e. true in every possible world.") Merge.kif 17413-17414
(instance Necessity AlethicAttribute) Merge.kif 17412-17412

appearance as argument number 2
-------------------------


(termFormat ChineseLanguage Necessity "必要性") domainEnglishFormat.kif 40059-40059
(termFormat ChineseTraditionalLanguage Necessity "必要性") domainEnglishFormat.kif 40058-40058
(termFormat EnglishLanguage Necessity "necessity") domainEnglishFormat.kif 40057-40057

antecedent
-------------------------


(<=>
    (modalAttribute ?FORMULA Necessity)
    (not
        (modalAttribute
            (not ?FORMULA) Possibility)))
Merge.kif 17416-17418
(=>
    (and
        (instance ?AGENT AutonomousAgent)
        (potentialCustomer ?CUST ?AGENT)
        (modalAttribute
            (and
                (instance ?R Reserving)
                (destination ?R ?AGENT)) Necessity)
        (conditionalProbability
            (exists (?RES1)
                (and
                    (instance ?RES1 Reservation)
                    (reservingEntity ?CUST ?RES1)
                    (fulfillingEntity ?AGENT ?RES1)))
            (customer ?CUST ?AGENT) ?NUM1)
        (conditionalProbability
            (not
                (exists (?RES2)
                    (and
                        (instance ?RES2 Reservation)
                        (reservingEntity ?CUST ?RES2)
                        (fulfillingEntity ?AGENT ?RES2))))
            (customer ?CUST ?AGENT) ?NUM2))
    (lessThan ?NUM2 ?NUM1))
Dining.kif 772-795
(=>
    (modalAttribute ?FORMULA Necessity)
    (modalAttribute ?FORMULA Possibility))
Merge.kif 17420-17422


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