| NullSet(null set) | | null_set, null_space |
| 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 5528-5528 | |
| (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 5526-5526 | Null set is a subclass of set |
| appearance as argument number 2 |
|
|
| (termFormat ChineseLanguage NullSet "空集") | domainEnglishFormat.kif 41458-41458 | |
| (termFormat ChineseTraditionalLanguage NullSet "空集") | domainEnglishFormat.kif 41457-41457 | |
| (termFormat EnglishLanguage NullSet "null set") | domainEnglishFormat.kif 41456-41456 |
| antecedent |
|
|
| (=> (instance ?SET NullSet) (not (exists (?INST) (element ?INST ?SET)))) |
Merge.kif 5530-5534 |
|
|
|