Assertion: parabola | /r/HasProperty | wells
Facets:
Source sentences:
text: The points and (which can collapse to a single point in the degenerate case) are then the points of tangency of the lines and and the parabola (Wells 1991).
text: The points T A and T B (which can collapse to a single point in the degenerate case) are then the points of tangency of the lines PA and PB and the parabola (Wells 1991).