Wikidata entity: P2021
| P31 | instance of | ... | Q18608871 (Wikidata property for items about people) | Wikidata property for items about people |
| P31 | instance of | ... | Q22988631 (Wikidata property related to mathematics) | Wikidata property related to mathematics |
| P31 | instance of | ... | Q99567847 (Wikidata property with a single value that generally evolves over time) | Wikidata property with a single value that generally evolves over time |
| P6104 | maintained by WikiProject | ... | Q8487137 (WikiProject Mathematics) | WikiProject Mathematics |
| P2302 | property constraint | ... | Q21502838 (conflicts-with constraint) | conflicts-with constraint |
| P2302 | property constraint | ... | Q21503247 (item-requires-statement constraint) | item-requires-statement constraint |
| P2302 | property constraint | ... | Q21503250 (subject type constraint) | subject type constraint |
| P2302 | property constraint | ... | Q21510856 (required qualifier constraint) | required qualifier constraint |
| P2302 | property constraint | ... | Q21510860 (range constraint) | range constraint |
| P2302 | property constraint | ... | Q21514353 (allowed units constraint) | allowed units constraint |
| P2302 | property constraint | ... | Q51723761 (no-bounds constraint) | no-bounds constraint |
| P2302 | property constraint | ... | Q52004125 (allowed-entity-types constraint) | allowed-entity-types constraint |
| P2302 | property constraint | ... | Q52060874 (single-best-value constraint) | single-best-value constraint |
| P2302 | property constraint | ... | Q52848401 (integer constraint) | integer constraint |
| P2302 | property constraint | ... | Q53869507 (property scope constraint) | property scope constraint |
| P3254 | property proposal discussion | Url | Wikidata:Property proposal/Archive/33 - Wikidata | ??? |
| P2875 | property usage tracking category | ... | Q23909015 (Category:Pages using Wikidata property P2021) | Category:Pages using Wikidata property P2021 |
| P1896 | source website for the property | Url | None | ??? |
| P1896 | source website for the property | Url | MathSciNet | ??? |
| P2668 | stability of property value | ... | Q23611587 (continuously changes / unstable identifier) | continuously changes / unstable identifier |
| P1629 | Wikidata item of this property | ... | Q243972 (Erdős number) | Erdős number |
| P1855 | Wikidata property example | ... | Q173746 (Paul Erdős) | Paul Erdős |
| P1855 | Wikidata property example | ... | Q309820 (Louis Ignarro) | Louis Ignarro |
| P1855 | Wikidata property example | ... | Q3454165 (Kevin Bacon) | Kevin Bacon |
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