Assertion: triangulation's point | /r/HasProperty | removed
Facets:
Source sentences:
text: Displacement of a vertex is done by: first, verifying if the triangulation embedding remains planar after the displacement; if yes the vertex is directly placed at the new location; otherwise, a point is inserted at the new location and the vertex at the obsolete location is removed.
text: Because hidden points can reappear later on as vertices when some other point is removed, they have to be stored somewhere.