Dirk Gently's Holistic Detective Agency is a novel by Douglas Adams, as well as the name of the detective agency featured in the Dirk Gently series. The main character of the story is Dirk Gently, a private detective[?] with unusual methods. It includes the unfinished portion of Coleridge's Kubla Khan.
... both of which are real. (Geometrically, this means that the parabola intersects the x-axis in two points.)
If the discriminant is negative, then there are two different ...