This extended de l'Hôpital 's book, written more that half a century earlier, to cover the integral calculus and also updated the differential calculus providing an up-to-date text. George writes in:
Ito extended de l'Hôpital 's libro, mas maraming nakasulat na kalahati ng isang daang taon na mas maaga, upang masakop ang kailangan din calculus at na-update ang kaugalian calculus magbibigay ng isang up-to-date text. George magsusulat sa: