The first edition of The Epistle of the Number, composed in Syracuse, Sicily, at the end of the 14th century. It is the first known Hebrew treatise to include extensive algebraic theories and procedures, exposing novel mathematical vocabulary, and enhancing our understanding of the linguistic mechanisms which helped create scientific vocabulary in medieval Hebrew.

Morony compares conditions in late Sasanian and early Islamic Iraq in the seventh century AD and depicts both the emergence of a local form of Islamic society, and the interaction of Muslim conquerors from Arabia with the native population.

This volume presents a systematic and detailed elaboration of the halakhic (legal) decisions written by five of the most important authors who wrote responsa concerning conversos between the years 1391 and 1492. The expulsion was an event that radically changed the perspectives of the Iberian conversos. The halakhic authorities were confronted with an absolutely new situation, in which they had to reformulate their position towards the conversos. This volume presents all the responsa written in connection with conversos by Isaac b. Sheshet Perfet, Simeon b. Ṣemaḥ Duran and his descendants: Solomon b. Simeon Duran, Ṣemaḥ b. Solomon Duran and Simeon b. Solomon Duran.