 A clear and strong influence of the Arab philosopher al-Kindi (d. 873) is evident in the work of Isaac Israeli. Like the former, he wrote a book of definitions, many of which are strongly similar to definitions in al-Kindi’s Fi Hudud al-ashya’ wa-rusumiha. Scholars Altmann and Stern illustrate the extensive similarities between the two books in their commentary on Israeli’s Book of Definitions in their study Isaac Israeli: A Neoplatonic Philosopher of the Early Tenth Century. Further, Israeli uses much of al-Kindi’s terminology for both astronomical and terrestrial objects. Nonetheless, it would be wrong to call the book a paraphrase of al-Kindi, as there are numerous divergences as well.