Parabola
Parabola in space

The definition of a parabola in this section gives a parametric representation of an arbitrary parabola, even in space, if one allows f → 0, f → 1, f → 2 {\displaystyle {\vec {f}}\!_{0},{\vec {f}}\!_{1},{\vec {f}}\!_{2}} to be vectors in space.
startend:quotation