If you know how to differentiate, you have probably heard of L’Hôpital’s Rule for limits of indeterminate forms. Guillaume de L’Hôpital was a French mathematician who was born in February of 1661, and after he died, Bernoulli claimed he had an agreement with L’Hôpital in which Bernoulli would receive 300 francs per year in exchange of his discoveries, and he claimed as well that most of what was published in L’Hôpital’s belonged to him. Later, some people found documentation that support his claims. Either way, the rule that we all know as L’Hôpital’s rule, does not have his name in his book. Moreover, he published the book as anonymous and thanked Bernoulli for his help.