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KB Term:  Term intersection
English Word: 

  Necessity

Sigma KEE - Necessity
Necessity(necessity)essential, fatal, fateful, ineluctable, inescapable, inevitable, inevitably, must, necessarily, necessary, necessity, needfully, needs, of_necessity, prerequisite, requirement, requisite, unavoidable, unnecessary, unneeded

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 16204-16205
(instance Necessity AlethicAttribute) Merge.kif 16203-16203 Necessity is an instance of alethic attribute

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


(termFormat ChineseLanguage Necessity "必要性") domainEnglishFormat.kif 39976-39976
(termFormat ChineseTraditionalLanguage Necessity "必要性") domainEnglishFormat.kif 39975-39975
(termFormat EnglishLanguage Necessity "necessity") domainEnglishFormat.kif 39974-39974

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


(<=>
    (modalAttribute ?FORMULA Necessity)
    (not
        (modalAttribute
            (not ?FORMULA) Possibility)))
Merge.kif 16207-16209 The statement a formula has the modal force of necessity if and only if the statement the formula doesn't have the modal force of 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 16211-16213


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