 There were no outstanding logicians among the Jews in the Islamicate world, but in Christian Europe from the thirteenth century onwards a lively tradition of logic grew up. It was based initially on Hebrew translations of al-Fārābī’s short commentaries and Averroes’s middle commentaries on Aristotle’s Organon and the logical part of al-Ghazālī’s Opinions. But Jewish scholars also became familiar with some Latin material, such as Peter of Spain’s Treatise (especially the parts on the logica vetus). Gersonides was an original logician, who wrote widely-studied supercommentaries on Averroes’s middle commentaries, where he is often critical of Averroes, and a treatise, the Book of the Correct Syllogism, remarkable for its degree of formalization (see Manekin 2012).