Assertion: parabola's vertex | /r/HasProperty | minimum point
Facets:
value: if #a>0#
type: OTHER
value: in a parabola
type: LOCATION
Source sentences:
text: A parabola that opens upward contains a vertex that is a minimum point; a parabola that opens downward contains a vertex that is a maximum point.
text: The vertex is the minimum point in a parabola that opens upward.
text: If #a>0# , the vertex is the minimum point and the parabola opens upward.