[Calculus] has two major branches, differential calculus and integral calculus; the former concerns instantaneous rates of change, and the slopes of curves, while the latter concerns accumulation of quantities, and areas under or between curves.
About a third of the way from Dubhe (the Big Dipper’s front bowl star) to Polaris (and a just a bit to the east) lies Giausar, the tail star of Western Draco the Dragon, to which Bayer assigned the Greek letter Lambda.