Assertion: curvature's curvature | /r/HasAspect | a limit value
Facets:
value: at these points
type: TEMPORAL
Source sentences:
text: This means that the surface is presumed to be smooth (everywhere of class $ C ^ {1} $), but that at certain isolated points it does not belong to $ C ^ {2} $; at these points, the curvature must have a limit value.