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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。") 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 instance Necessity and 真理属性

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 modalAttribute 公式 and Necessity modalAttribute 公式 and Possibility
(=>
    (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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