# L'Hôpital's rule

> English word · Proper noun · IPA /ˌloʊpiːˈtɑːlz ˈɹuːl/

## Definitions
1. The rule that the limit of the ratio of two functions equals the limit of the ratio of their derivatives, usable when the former limit is indeterminate and the latter limit exists.

## Etymology
Named after French mathematician Guillaume de l'Hôpital (1661–1704).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/l-hopital-s-rule