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Three singular treatises from Yemeni manuscripts

I should like to discuss briefly three Arabic treatises that are quite different from one another with regard to content, authorship, and provenance. They do, however, share one interesting feature. Each one survives in just two manuscript copies, both in a Yemeni hand, the one in Arabic script, the other also in the Arabic language but written in Hebrew characters. The circumstances of their survival are instructive concerning the intellectual histories of both Jews and Muslims in the Yemen, and especially with regard to the relationships that obtained between these two communities. We may also add that none of these treatises, each of which is of some interest to its respective field, has been the subject of even a cursory study.