It is widely understood that Johann Bernoulli developed the mathematics behind what is commonly known as L'Hospital's Rule. It basically came down to the fact that Bernoulli was tutoring L'Hospital, and L'Hospital in turn was recording all of his lectures for use in a book on calculus. The book was published and the rule named after L'Hospital. As credence has been lent to this notion over the years some have started calling it Bernoulli's Rule. It's an interesting idea, and I thought I'd mention it.What is the relationship between Bernouilli and limit problem ? I know we may make use of L'Hospital rule to solve it so you talk about him but i am wondering why you talk about Bernouilli .