In the handing down of Aristotle's thought to the Christian west in the middle ages, al-Farabi played an essential part as appears in the translation of al-Farabi's Commentary and Short Treatise on Aristotle's de Interpretatione that F.W. Zimmermann published in 1981. Al-Farabi had a great influence on Maimonides, the most important Jewish thinker of the middle ages. Maimonides wrote in Arabic the celebrated Maqala fi sina at al-mantiq (Treatise on logic), in a wonderfully concise way. The work treats of the essentials of Aristotelian logic in the light of comments made by the Persian philosophers: Avicenna and, above all, al-Farabi. Rémi Brague in his book devoted to the Treatise stresses the fact that al-Farabi is the only thinker mentioned therein.