Jacob ben Nissim

Jacob ben Nissim ibn Shahin was a Jewish philosopher and mathematician who lived at Kairouan, Tunisia in the 10th century; he was a younger contemporary of Saadia. At Jacob's request Sherira Gaon wrote a treatise entitled Iggeret, on the redaction of the Mishnah. Jacob is credited with the authorship of an Arabic commentary on the Sefer Yeẓirah (translated into Hebrew by Moses ben Joseph). He asserts in the introduction that Saadia, while living in Egypt, used to address very insignificant questions to Isaac ben Solomon of Kairouan, and that, on receiving Saadia's commentary, he found that the text had not been understood by the commentator. Jacob therefore decided to write another commentary. In the same introduction Jacob speaks of Galen, repeating the story that that celebrated physician was a Jew named "Gamaliel." The Hebrew translation of Jacob's commentary is still extant in manuscript;[1] excerpts from it have been given by M. H. Landauer and Dukes.

Jacob ben Nissim wrote a work on Indian mathematics under the title Ḥisab al-Ghubar (Hebrew: האבק חשבון).

His son and student, Nissim (referred to in later Rabbinic literature as Rabbeinu Nissim, or in Hebrew רבנו ניסים), would later become the head of Yeshiva at Kairouan.

יעקב בן ניסים|

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רבנו נסים

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Students

## References

1. ↑ Munich MSS., No. 92, 20; De Rossi MSS., No. 769

This article incorporates text from a publication now in the public domain: Kaufmann Kohler and Isaac Broydé (1901–1906). "Jacob ben Nissim ibn Shahin". in Singer, Isidore. The Jewish Encyclopedia. New York: Funk & Wagnalls. http://www.jewishencyclopedia.com/view.jsp?letter=J&artid=86. It has the following bibliography:

* M. H. Landauer, in Orient, vii. 121;
* Julius Fürst, ib. vi. 562;
* Dukes, Ḳonṭres ha-Masoret;
* Salomon Munk, Notice sur Aboulwalid, p. 47;
* Moritz Steinschneider, Cat. Bodl. col. 1243;
* idem, Hebr. Uebers. p. 396;
* idem, Die Arabische Literatur der Juden, § 58.K

New title |  Rosh Yeshiva of Kairouan
?-1006  | Succeeded by
Chushiel ben Elchanan

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