L'H?pital's law is determined under certain conditions by taking derivatives of the numerator and denominator respectively, and then finding the limit. Uncertain method. French mathematician. However, you may not know that L'H?pital is actually a "Gao Fushuai". 1694 On July 22nd, he wrote a letter to his teacher, johann bernoulli. In the letter, he was outspoken and asked the teacher to sell him an important research achievement (we call it "Robida's Law" today), and asked the teacher to bid. Unexpectedly, Bernoulli readily accepted, and took the initiative to find L'H?pital, a student, with one hand to pay and one hand to deliver. So L'H?pital published this rule in 1696' s Analysis of Infinitesimal Curves. Because of this law, L'H?pital became famous, but the real creator of this law was forgotten by most people.

Finding the limit is one of the important contents and the basic part of higher mathematics, so it is of great significance to master the method of finding the limit skillfully. Robida's law is used to find the fractional limit of numerator and denominator approaching zero.