Property talk:P1851

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input set
a superset of the domain of a function or relation that may include some inputs for which the function is not defined; to specify the set of only those inputs for which the function is defined use domain (P1568)

Description	See also: definition domain (P1568), codomain (P1571)
Represents	input set (Q18720436)
Data type	Item
Domain	According to this template: instances of mapping (Q370502), function (Q11348), morphism (Q1948412), binary relation (Q130901) According to statements in the property: mapping (Q370502), function (Q11348), morphism (Q1948412) or binary relation (Q130901) When possible, data should only be stored as statements
Allowed values	instances of set (Q36161), class (Q217594) (note: this should be moved to the property statements)
Example	tangent (Q1129196) → set of real numbers (Q1174982)
Tracking: usage	Category:Pages using Wikidata property P1851 (Q126375284)
See also	definition domain (P1568), codomain (P1571), image of function (P2396)
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/P1851 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 43 Main statement 38 88.4% of uses Qualifier 5 11.6% of uses
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[create Create a translatable help page (preferably in English) for this property to be included here]

Type “mapping (Q370502), function (Q11348), morphism (Q1948412), binary relation (Q130901)”: item must contain property “instance of (P31), subclass of (P279)” with classes “mapping (Q370502), function (Q11348), morphism (Q1948412), binary relation (Q130901)” 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/P1851#Type Q370502, Q11348, Q1948412, Q130901, SPARQL

Value type “set (Q36161), class (Q217594)”: This property should use items as value that contain property “instance of (P31), subclass of (P279)”. On these, the value for instance of (P31), subclass of (P279) should be an item that uses subclass of (P279) with value set (Q36161), class (Q217594) (or a subclass thereof). (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/P1851#Value type Q36161, Q217594, SPARQL

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/P1851#Single value, SPARQL