Assertion: parabola | /r/HasProperty | limiting case of an ellipse
Facets:
Source sentences:
text: A parabola is a limiting case of an ellipse in which one of the foci is a point at infinity.
text: Just as the circle is a limiting case of the ellipse when the two foci coincide, the parabola is a limiting case of the ellipse when one of the foci is moved to infinity.