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Sigma KEE - NullSet

appearance as argument number 1

(documentation NullSet ChineseLanguage "任何没有实例的 SetOrClass") chinese_format.kif 2310-2310
(documentation NullSet EnglishLanguage "Any Set that contains no elements.") Merge.kif 5424-5424
(subclass NullSet Set) Merge.kif 5422-5422 subclass NullSet and Set

appearance as argument number 2

(termFormat ChineseLanguage NullSet "空集") domainEnglishFormat.kif 41412-41412
(termFormat ChineseTraditionalLanguage NullSet "空集") domainEnglishFormat.kif 41411-41411
(termFormat EnglishLanguage NullSet "null set") domainEnglishFormat.kif 41410-41410


    (instance ?SET NullSet)
        (exists (?INST)
            (element ?INST ?SET))))
Merge.kif 5426-5430

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