James Graham Ballard (born November 18, 1930) is a Britishnovelist remarkable for the range of genres of his novels - science fiction, modernistic art novel, and historical setting. A great many of his writings are about dystopias.
... is real. (Geometrically, this means that the parabola described by the quadratic equation touches the x-axis in a single point.)
If the discriminant is positive, then ...