Calculus is certainly not teaching horse about donkey and is not teaching donkey about horse. Being no.1 is retaining or making to retain no.2 as no.2 in its no.2;retaining no.3 as no.3 in its no.3 and retaining no.4 as no.4 in its no.4 and so on.....among ten(many). TEN IS UPPER LIMIT. And ONE IS LOWER LIMIT. Calculus is retainment of infinite as depth and width between one to ten limits.