L'Hospital's rule

American  

noun

Mathematics.

1. the theorem that for the quotient of two functions satisfying certain conditions on a given closed interval, each having infinite limit or zero as limit at a given point, the limit of the quotient at the given point is equal to the limit of the quotient of the derivatives of each function.

---

Etymology

Origin of L'Hospital's rule

Named after G. F. A. de L'Hospital