| NullSet(null set) | | null_set, null_space |
| appearance as argument number 1 |
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| (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 5519-5519 | |
| (documentation NullSet JapaneseLanguage "インスタンスを含まない任意の SetOrClass。") | japanese_format.kif 982-982 | |
| (subclass NullSet Set) | Merge.kif 5517-5517 | Null set is a subclass of set |
| appearance as argument number 2 |
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| (termFormat ChineseLanguage NullSet "空集") | domainEnglishFormat.kif 41465-41465 | |
| (termFormat ChineseTraditionalLanguage NullSet "空集") | domainEnglishFormat.kif 41464-41464 | |
| (termFormat EnglishLanguage NullSet "null set") | domainEnglishFormat.kif 41463-41463 |
| antecedent |
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| (=> (instance ?SET NullSet) (not (exists (?INST) (element ?INST ?SET)))) |
Merge.kif 5521-5525 |
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