Property talk:P6438

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Euler characteristic
topological invariant of a space; the alternating sum of the dimensions of the (co)homology of a space

Represents	Euler characteristic (Q852973)
Data type	Quantity
Domain	topological space (Q179899)
Allowed units	not applicable
Example	sphere (Q12507) → 2 small stellated dodecahedron (Q1234054) → −6 torus (Q12510) → 0 real projective plane (Q633815) → 1
Tracking: usage	Category:Pages using Wikidata property P6438 (Q106596192)
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 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) Minimum and maximum Items with highest numeric value Items with lowest numeric value Database reports/Constraint violations/P6438 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 37 Main statement 33 89.2% of uses Qualifier 4 10.8% of uses

[create Create a translatable help page (preferably in English) for this property to be included here]

Type “topological space (Q179899)”: item must contain property “instance of (P31), subclass of (P279)” with classes “topological space (Q179899)” 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/P6438#Type Q179899, SPARQL

Units: “novalue”: value unit must be one of listed. (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/P6438#Units

This property is being used by: ca:Plantilla:Infotaula de polítop Please notify projects that use this property before big changes (renaming, deletion, merge with another property, etc.)