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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

No TPTP formula. May not be expressible in strict first order.	chinese_format.kif 3891-3892
No TPTP formula. May not be expressible in strict first order.	Merge.kif 17153-17154
No TPTP formula. May not be expressible in strict first order.	Merge.kif 17152-17152	Necessity is an instance of alethic attribute

appearance as argument number 2

No TPTP formula. May not be expressible in strict first order.	domainEnglishFormat.kif 40044-40044
No TPTP formula. May not be expressible in strict first order.	domainEnglishFormat.kif 40043-40043
No TPTP formula. May not be expressible in strict first order.	domainEnglishFormat.kif 40042-40042

antecedent

No TPTP formula. May not be expressible in strict first order.	Merge.kif 17156-17158	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
No TPTP formula. May not be expressible in strict first order.	Dining.kif 725-748	If an agent is an instance of agent and a cognitive agent is a potential customer for the agent and the statement an entity is an instance of reserving and the entity ends up at the agent has the modal force of necessity and probability of there exists the entityES1 such that the entityES1 is an instance of reservation and the cognitive agent reserves the entityES1 and the agent fulfills the entityES1 provided that the agent is a customer of the cognitive agent holds is a real number and probability of there doesn't exist the entityES2 such that the entityES2 is an instance of reservation and the cognitive agent reserves the entityES2 and the agent fulfills the entityES2 provided that the agent is a customer of the cognitive agent holds is another real number, then the other real number is less than the real number
No TPTP formula. May not be expressible in strict first order.	Merge.kif 17160-17162	If the statement a formula has the modal force of necessity, then the statement the formula has the modal force of possibility

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