Assertion: polyhedron's surface | /r/HasProperty | considered
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: Sometimes the interior volume is considered to be part of the polyhedron, sometimes only the surface is considered, and occasionally only the skeleton of edges or even just the set of vertices.
text: The polyhedron surrounds a bounded volume in three-dimensional space; sometimes this interior volume is considered to be part of the polyhedron, sometimes only the surface is considered, and occasionally only the skeleton of edges.