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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 16084-16085
(instance Necessity AlethicAttribute) Merge.kif 16083-16083 instance Necessity and AlethicAttribute

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


(termFormat ChineseLanguage Necessity "必要性") domainEnglishFormat.kif 39979-39979 termFormat ChineseLanguage, Necessity and "必要性"
(termFormat ChineseTraditionalLanguage Necessity "必要性") domainEnglishFormat.kif 39978-39978 termFormat ChineseTraditionalLanguage, Necessity and "必要性"
(termFormat EnglishLanguage Necessity "necessity") domainEnglishFormat.kif 39977-39977 termFormat EnglishLanguage, Necessity and "necessity"

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


(<=>
    (modalAttribute ?FORMULA Necessity)
    (not
        (modalAttribute
            (not ?FORMULA) Possibility)))
Merge.kif 16087-16089 modalAttribute Formula and Necessity modalAttribute Formula 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 725-748
(=>
    (modalAttribute ?FORMULA Necessity)
    (modalAttribute ?FORMULA Possibility))
Merge.kif 16091-16093


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