Assertion: unit sphere | /r/HasProperty | the set of points of distance
Facets:
value: from a fixed central point
type: LOCATION
value: in mathematics
type: OTHER
Source sentences:
text: In mathematics, a unit sphere is the set of points of distance 1 from a fixed central point, where a generalized concept of distance may be used; a closed unit ball is the set of points of distance less than or equal to 1 from a fixed central point.