Property talk:P8864

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identity element
value of the identity element of the mathematical operation

Represents	identity element (Q185813)
Data type	Item
Domain	binary operation (Q164307)
Example	addition (Q32043) → zero (Q204) multiplication (Q40276) → 1 (Q199) matrix addition (Q2264115) → zero matrix (Q338028)
Tracking: usage	Category:Pages using Wikidata property P8864 (Q120093164)
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/P8864 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 10 Main statement 7 70% of uses Qualifier 3 30% of uses
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[create Create a translatable help page (preferably in English) for this property to be included here]

Type “binary operation (Q164307)”: item must contain property “subclass of (P279)” with classes “binary operation (Q164307)” 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/P8864#Type Q164307, SPARQL

Value type “mathematical object (Q246672)”: 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 mathematical object (Q246672) (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/P8864#Value type Q246672, SPARQL

Scope is as main value (Q54828448): the property must be used by specified way only (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/P8864#Scope, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (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/P8864#Entity types