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KB Term:  Term intersection
English Word: 

  Necessity

 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。") Merge.kif 17806-17807
(documentation Necessity EnglishLanguage "Attribute that applies to Propositions that are necessary, i.e. true in every possible world.") Merge.kif 17804-17805
(instance Necessity AlethicAttribute) Merge.kif 17803-17803 Necessity 是 真势属性 的 instance

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


(termFormat EnglishLanguage Necessity "necessity") domainEnglishFormat.kif 7096-7096 termFormat EnglishLanguage, Necessity and "necessity"

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


(<=>
    (modalAttribute ?FORMULA Necessity)
    (not
        (modalAttribute
            (not ?FORMULA) Possibility)))		 Merge.kif 17809-17811 公式 的声明 has Necessity 的语气 若且唯若 那个 公式 的声明 doesn't have Possibility 的语气
(=>
    (and
        (instance ?AGENT Agent)
        (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 729-752
(=>
    (modalAttribute ?FORMULA Necessity)
    (modalAttribute ?FORMULA Possibility))		 Merge.kif 17813-17815


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