Property talk:P2820

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cardinality of this set
measure of number of elements of a set

Represents	cardinality (Q4049983)
Data type	Item
Domain	According to this template: set (Q36161) According to statements in the property: set (Q36161) When possible, data should only be stored as statements
Example	rational number (Q1244890) → aleph null (Q1445491) empty set (Q226183) → zero (Q204)
Tracking: usage	Category:Pages using Wikidata property P2820 (Q124306380)
See also	group cardinality (P1164)
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties By value of property Most statements Fewest statements Most sitelinks Most linked wikis Total of sitelinks on items Most identifiers Fewest identifiers Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Database reports/Constraint violations/P2820 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 73 Main statement 63 86.3% of uses Qualifier 10 13.7% of uses
Search for values

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Single value: this property generally contains a single value. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2820#Single value, SPARQL

Type “set (Q36161)”: item must contain property “instance of (P31), subclass of (P279)” with classes “set (Q36161)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2820#Type Q36161, SPARQL

Conflicts with “quantity (P1114)”: this property must not be used with the listed properties and values. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2820#Conflicts with P1114, SPARQL