Phoebus was the name used in classical mythology for Apollo in his role as god of the sun. His son was Phaeton. Under the alternate spelling Phevos and together with Athena, he is a mascot of the 2004 Summer Olympics in Athens.
... – 4ac is called the discriminant of the quadratic equation, because it discriminates between three qualitatively different cases:
If the discriminant is zero, then ...