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7/31/2019 Contributions to Mathematics
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7/31/2019 Contributions to Mathematics
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discoveries as he pleased. L'Hpital authored the first textbook on calculus, "l'Analyse des
Infiniment Petits pour l'Intelligence des Lignes Courbes", which mainly consisted of the work
of Bernoulli, including what is now known asL'Hpital's rule.In calculus,l'Hpital's rule
(also calledBernoulli's rule) uses derivatives to help evaluate limits involving indeterminate
forms. Application (or repeated application) of the rule often converts an indeterminate form
to a determinate form, allowing easy evaluation of the limit. The rule is named after the 17th-
century French mathematician Guillaume de l'Hpital, who published the rule in his book
l'Analyse des Infiniment Petits pour l'Intelligence des Lignes Courbes(literal translation:
Analysis of the Infinitely Small to Understand Curved Lines) (1696), the first textbook on
differential calculus. However, it is believed that the rule was discovered by the Swiss
mathematician Johann Bernoulli.
The Stolz-Cesro theorem is a similar result involving limits of sequences, but it uses finite
difference operators rather than derivatives.
In its simplest form, l'Hpital's rule states that for functions and g:
If or and exists,
then
The differentiation of the numerator and denominator often simplifies the quotient and/or
converts it to a determinate form, allowing the limit to be evaluated more easily
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