Assertion: curve's vertex | /r/HasProperty | point
Facets:
value: for space curves
type: TRANSITIVE-OBJECT
value: in the geometry of planar curves
type: OTHER
Source sentences:
text: In the geometry of planar curves, a vertex is a point of where the first derivative of curvature is zero.
text: For space curves, on the other hand, a vertex is a point where the torsion vanishes.
text: Vertices are points where the curve has 4-point contact with the osculating circle at that point.