Immanuel Bonfils

Immanuel Bonfils was a prominent mathematician and astronomer of medieval times, active between 1340 and 1377. Born as Immanuel ben Jacob Bonfils, he was a rabbi who made significant contributions to the field of astronomy. His work built upon the foundations laid by notable figures such as Gersonides, a pioneer in trigonometry, and Al-Battani, demonstrating his engagement with the intellectual traditions of his era.

Bonfils' academic career included teaching positions in Orange and later residing in Tarascon, both locations within the Holy Roman Empire that are now part of modern-day France. Notably, he was associated with the academy founded by Gersonides in Orange, where he shared his knowledge of astronomy and mathematics. Bonfils is credited with pioneering achievements in exponential calculus and the development of decimal fractions, underscoring his importance in the history of mathematics and astronomy.