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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。") 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 is an instance of alethic attribute

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


(termFormat EnglishLanguage Necessity "necessity") domainEnglishFormat.kif 7096-7096 "necessity" is the printable form of necessity in english language

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


(<=>
    (modalAttribute ?FORMULA Necessity)
    (not
        (modalAttribute
            (not ?FORMULA) Possibility)))
Merge.kif 17809-17811 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 729-752
(=>
    (modalAttribute ?FORMULA Necessity)
    (modalAttribute ?FORMULA Possibility))
Merge.kif 17813-17815


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