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KB Term:  Term intersection
English Word: 

  Necessity

 Sigma KEE - Necessity
Necessity(必要性)

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 16187-16188
(instance Necessity AlethicAttribute) Merge.kif 16186-16186 必要性 是 真势属性 的 instance

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


(termFormat ChineseLanguage Necessity "必要性") domainEnglishFormat.kif 39955-39955
(termFormat ChineseTraditionalLanguage Necessity "必要性") domainEnglishFormat.kif 39954-39954
(termFormat EnglishLanguage Necessity "necessity") domainEnglishFormat.kif 39953-39953

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


(<=>
    (modalAttribute ?FORMULA Necessity)
    (not
        (modalAttribute
            (not ?FORMULA) Possibility)))		 Merge.kif 16190-16192 公式 的声明 has 必要性 的语气 若且唯若 那个 公式 的声明 doesn't have 可能性 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 725-748
(=>
    (modalAttribute ?FORMULA Necessity)
    (modalAttribute ?FORMULA Possibility))		 Merge.kif 16194-16196


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