Wikidata entity: Q226183
| P2820 | cardinality of this set | ... | Q204 (zero) | zero |
| P373 | Commons category | String | Nested set V4 | ??? |
| P1343 | described by source | ... | Q109490582 (ISO 80000-2:2019 Quantities and units — Part 2: Mathematics) | ISO 80000-2:2019 Quantities and units — Part 2: Mathematics |
| P1889 | different from | ... | Q28827 (Ø) | Ø |
| P1889 | different from | ... | Q1201815 (null set) | null set |
| P1889 | different from | ... | Q30027695 (singleton of 0) | singleton of 0 |
| P31 | instance of | ... | Q1201815 (null set) | null set |
| P31 | instance of | ... | Q39604693 (0-ad) | 0-ad |
| P31 | instance of | ... | Q272404 (finite set) | finite set |
| P31 | instance of | ... | Q320357 (closed set) | closed set |
| P31 | instance of | ... | Q213363 (open set) | open set |
| P31 | instance of | ... | Q36161 (set) | set |
| P6104 | maintained by WikiProject | ... | Q8487137 (WikiProject Mathematics) | WikiProject Mathematics |
| P913 | notation | ... | Q87524418 (???) | ??? |
| P5008 | on focus list of Wikimedia project | ... | Q6173448 (Wikipedia:Vital articles/Level/4) | Wikipedia:Vital articles/Level/4 |
| P461 | opposite of | ... | Q10533491 (non-empty set) | non-empty set |
| P361 | part of | ... | Q28659876 (list of types of sets) | list of types of sets |
| P460 | said to be the same as | ... | Q39604693 (0-ad) | 0-ad |
| P1993 | TeX string | String | \empty | ??? |
| P1993 | TeX string | String | \emptyset | ??? |
| P1993 | TeX string | String | \varnothing | ??? |
| P6771 | Arabic Ontology concept ID | 293242 |
| P7554 | Encyclopedia of Mathematics article ID | Empty_set |
| P646 | Freebase ID | /m/02ly0 |
| P11514 | Great Russian Encyclopedia portal ID | pustoe-mnozhestvo-aa612b |
| P8313 | Lex ID | Ø_-_den_tomme_mængde |
| P2812 | MathWorld ID | EmptySet |
| P12888 | Metamath statement ID | df-nul |
| P6366 | Microsoft Academic ID (discontinued) | 93713127 |
| P4215 | nLab ID | empty set |
| P6781 | ProofWiki ID | Definition:Empty_Set |
| P9621 | Treccani's Enciclopedia della Matematica ID | insieme-vuoto |
| P12800 | Vikidia article ID | fr:Ensemble_vide |
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